Law Enforcement

This intervention involves officers wearing cameras on their uniforms to increase citizens’ intentions to comply with police and improve their perceptions of police during traffic stops. The program is rated Promising. Drivers who encountered officers with cameras had statistically significant increases in both compliance and cooperation with officers and improved perceptions of procedural justice and police legitimacy, compared with drivers who encountered officers not wearing cameras. 

The program focuses on reducing violent gun crime by disrupting the cycle of gun violence by relying on forensic science and data analysis to identify, investigate, and prosecute individuals who use guns in criminal activity, and the sources of their guns. The program is rated Promising. The program did not significantly affect homicides or aggravated assaults with a firearm but was shown to significantly reduce violent crime and robbery with a firearm.

This program was a place-based crime policing initiative implemented for 1 year to reduce violent crime. Risk-based policing initiatives promote data-informed decisions based on a process of defining the problem, gathering information, and analyzing data. The program is rated Promising. The program resulted in a statistically significant reduction of 22.6 percent in violent crimes in the intervention areas, compared with the comparison areas.

The mobile device and software for this program were developed to enable frontline police officers to access police database records and upload timely and accurate information while out in the field. This program is rated Promising. The program led to statistically significantly increases in the total number of recorded street checks, the total number of recorded driving offenses, and the number of drug offenses (possession and use) recorded per month by police officers.

This involves police officers wearing cameras on their uniforms to improve the civility of their interactions with citizens. The program is rated Effective. There were statistically significant reductions in citizen complaints against police and police use-of-force reports for officers who wore cameras, compared with those who did not, and statistically significant reductions in complaints against control officers in the treatment districts, compared with officers in the untreated districts.

This involves prison time for individuals who have committed drunk-driving offenses to reduce their risk of recidivism upon their release. The program is rated Ineffective. There was no statistically significant difference between individuals in the treatment group (who received prison time) and the comparison group (who received a suspended imprisonment sentence) on reoffending with a driving-while-under-the-influence-of-alcohol offense within 6 months’, 24 months’, or 5 years’ time.

This program involves 15 minutes of police patrol in high-crime hot spots to reduce crime. The program is rated Promising. There were statistically significant reductions in reports of violent crimes and robbery and other crimes against personal victims in hot spots on treatment days, compared with control days.

This program seeks to reduce the rearrests of individuals previously convicted of driving while under the influence (DUI) of alcohol or drugs through intensive testing and monitoring of drug and alcohol consumption. The program is rated Promising. There was a statistically significant decrease in the rates of DUI arrests by roughly 9 percent in counties that implemented the program, compared with counties that did not implement the program.

This was a focused deterrence intervention designed to reduce the presence of gun violence and gang activity. The program is rated Promising. There was a statistically significant reduction in confirmed shots fired, residents’ reports of hearing gunshots, and residents’ reports of seeing gang activity. However, there was no statistically significant impact on calls for service for shots fired.

This is a framework of recommended practices for integrating police into the educational environment to enhance a safe school climate. The program is rated Ineffective. There were no statistically significant differences in treatment and control school students’ delinquency, victimization, exclusionary discipline, relationships with adults, perceptions of police, nor school bonding, connectedness, and safety. Treatment school students had statistically significant increases in rule clarity.

This program equips police with on-officer cameras to record their interactions with civilians. The program is rated Ineffective. Camera use had no statistically significant effects on officers’ total number of proactive activities, specifically on the number of traffic stops or business checks, nor on arrests, citizen complaints, and use-of-force incidents. Officers with cameras conducted statistically significantly fewer subject stops, and statistically significantly more park and walks.

This program involves police use of video to improve evidence gathering and police and citizen behavior. The program is rated Ineffective. There were no statistically significant differences in restraining orders issued or assaults on police between body-worn video treatment days and control days (when no officers wore body-worn video). Treatment days had statistically significantly higher rates of use of force, citizen complaints against police, and criminal charges, compared with control days.

This is a focused deterrence police strategy that was designed to reduce gang- and group-related violence in Detroit, Mich. The program is rated Ineffective. There were no statistically significant differences found for weapons arrests or shooting victimizations for participants in two age groups (15–24 and 25–34). The program did show a statistically significant reduction in all arrests and violent arrests for individuals who attended the Detroit Ceasefire call-in meetings.

This program involved the use of a crime forecasting model to direct police patrol to dynamic hot spots to reduce crime. The program is rated Promising. There were statistically significant reductions in daily crime volume (specifically burglary, car theft, and burglary-theft from vehicle) for police patrols in the treatment condition, compared with patrols in the control condition.

This policing strategy was designed to deter crime on platforms in high-crime areas of the London Underground. The program is rated Promising. Platforms in the treatment areas had statistically significant reductions in calls for services and crime, relative to the control group, on patrol and nonpatrol days.

This program involves law enforcement’s use of cameras to record interactions with civilians to reduce citizen fatalities. The program is rated Promising. Agencies that acquired cameras had statistically significant decreases in fatal police–citizen encounters after three years, compared with agencies that did not acquire cameras. There were no statistically significant differences in fatal encounters between a reduced set of agencies with cameras and matched agencies without cameras.

This was a focused deterrence violence-reduction strategy involving enforcement and services to targeted individuals to address gun and gang violence. The program is rated Promising. There were statistically significant reductions in community-level criminal shootings in treated areas, compared with matched comparison areas, and in shootings around treated gang territories, compared with areas around matched comparison gang territories, at 2 years’ postimplementation.

This intervention displayed online warning messages to Internet users attempting to view barely legal pornography or upload sexual photos of women, to reduce the accessing of child sexual exploitation material online. The program is rated Effective. Individuals in the experimental groups who received the online warning messages were statistically significantly less likely to attempt to enter the websites, compared with individuals who did not receive a warning message.

This program was designed to reduce excessive drinking among adolescents and young adults ages 12-25 through community-wide enforcement operations and awareness campaigns. The program is rated Promising. There was a statistically significant reduction in alcohol-related motor vehicle crashes among 15- to 30-year-old drivers in treatment group cities, compared with control group cities.

This is a place-based intervention that uses environmental design at high-crime businesses in the city to reduce crime and improve public safety. The program is rated Ineffective. There were no statistically significant effects on disorder occurrences or violent crime. The intervention did result in statistically significant reductions in property crime around treated businesses, compared with matched control businesses, at 1-year postimplementation.

This program equips police with body cameras to record encounters with civilians. The program is rated Ineffective. Camera use had no statistically significant effects on number of arrests, arrests with force, and summonses issued after 1 year. Officers wearing cameras had statistically significant reductions in complaints filed against them and made more stop reports. Camera use resulted in a statistically significantly reduced likelihood of lawful stops and frisks but fewer subjects searched.

The program involved the use of hot-spots policing tactics in certain neighborhoods of Montevideo to reduce incidents of robbery. The program is rated Promising. Compared with the control group hot-spot areas, treatment group hot-spot areas that received increased police presence (in the form of foot patrol) experienced a statistically significant reduction in robbery.

This is a parole-based, focused deterrence intervention. The goal of the program is to reduce community-level firearm violence. The program is rated Effective. The intervention was associated with statistically significant reductions in measures of total gun violence, total non-gun violence, and total violence, compared with the synthetic control group.

This is a police-driven, collaborative, place-based crime-reduction approach focused on a target neighborhood in Tulsa, Okla. The program is rated Promising. The initiative resulted in statistically significant reductions in total crime in both areas of the target neighborhood at the two post-intervention periods and a statistically significant reduction in burglary in one area. There were no statistically significant reductions in disorderly offenses and mixed results on the number of assaults.

The program is an alternative to formal processing in the juvenile justice system. The overall goal is to reduce the number of youths entering the juvenile justice system, while also reducing recidivism. The program is rated Promising. Youths in the treatment group who participated in the diversion program had statistically significantly fewer rearrests, compared with youths in the comparison group who did not participate in the intervention.

This is a collaborative law enforcement effort to collect, manage, and analyze crime gun evidence to identify serial shooters, disrupt criminal activity, and prevent future gun violence. The program is rated Promising. Posttest gun crime cases saw statistically significant increases in the likelihood of arrest, but no statistically significant difference in the likelihood of being charged or convicted, compared with cases in the pretest period.

This is a procedural justice checklist for counterterrorism police officers working in ports of travel in a European country to use when questioning people suspected of terrorism. The program is rated Effective. People interviewed by officers using the checklist reported a statistically significantly greater view of distributive justice, effectiveness of police, obligation to obey the law, and willingness to cooperate with the police, compared with people interviewed by control group officers.

The purpose of this program is to afford individuals who have committed a driving-under-the-influence (DUI) offense the opportunity to avoid the stigma of a criminal conviction and criminal labeling by expunging criminal records pertaining to the DUI offense through a diversion program. The program is rated Promising. Those in the diversion program were statistically significantly less likely to be rearrested within 4 years of the final disposition.

This initiative involves proactive policing, enhanced enforcement, sentences for individuals who repeatedly offend, and collaboration among multiple stakeholders. The program’s goal is to reduce violent crime and gun violence. The program is rated Promising. The implementation of the program led to a statistically significant reduction in violent crime in the treatment group relative to the control group. However, there was no statistically significant impact on the rate of gun crimes.

This intervention involves individuals under any form of supervision after release from incarceration in the state of Florida, with the goal of reducing their risks of recidivism. The program is rated Promising. There were statistically significant decreases in rearrest and reconviction rates for individuals under supervision, compared with those who did not receive supervision, at the 3-year follow-up.

This is a prosecutor-led pretrial diversion program to rehabilitate individuals with misdemeanor or felony offenses who are at low risk of reoffending. The program is rated Effective. There were statistically significant reductions in the rearrest rate, days to rearrest, and cases dismissed for treatment group individuals, compared with comparison group individuals, at the 2-year follow-up.

This strategy sought to reduce crime in Philadelphia by testing three different patrol strategies. The program is rated Ineffective. Relative to control areas, there was no statistically significant difference in violent or property crimes in areas using one of two of the patrol strategies. Property crimes in an area using one of the strategies saw a statistically significant decrease, while there was a statistically significant increase in violent crime in areas using two of the strategies.

This program equips police with on-officer cameras to record contacts with civilians during intimate-partner violence incidents. The program is rated Promising. Camera use was statistically significantly more likely to result in arrests, charges filed, cases furthered, and both guilty pleas and verdicts. There was no statistically significant difference in sentence length. However, there was a statistically significantly greater reduction in case processing time in cases not involving a camera.

This is a police training to develop officers’ decision-making, de-escalation, empathy, rapport-building, and self-control skills to discourage use of force in interactions with citizens. The program is rated Ineffective. There was a statistically significant increase in procedural justice priorities posttraining in the treatment group, compared with the control group, but there were no statistically significant effects on maintaining self-control, physical control priorities, or use of force.

This intervention seeks to increase staff ID checks for the sale of alcoholic beverages at licensed establishments, to help prevent sales to minors. The program is rated Effective. The results were mixed. One study found there was a statistically significant increase in age verification rates resulting from the intervention, whereas a second study found no statistically significant increases in ID-checking rates. Overall, the results suggest the intervention influenced ID-checking rates.

This was a mobile application for law enforcement officers that projected the locations of persons-of-interest based on their residences and other location information contained in the police department’s crime database. The program is rated Promising. Officers using the application had a statistically significant greater number of warrant arrests and information reports than officers in the control group. There was no statistically significant impact on citation arrests.

This is a focused-deterrence group violence reduction strategy (GVRS) designed to reduce or control gun violence in Oakland, Calif. The program is rated Effective. The intervention was shown to reduce total shootings, gang-involved shootings, suspected gang-involved shootings, and gang shooting victimizations in treatment block groups relative to matched comparison block groups. These differences were all statistically significant.

This was a modified focused deterrence program that targeted high-risk persons in Massachusetts. The program aimed to increase their risks of getting caught and convicted while providing them with regular meetings with a case management team and a variety of services such as substance abuse treatment. The program is rated No Effects. There were no statistically significant differences between the treatment group and the control group in time-to-arraignment at the 1-year follow-up.

This was an experiment designed to evaluate the effectiveness of hot spots policing in urban and suburban areas. The program is rated No Effects. There were no statistically significant differences between treatment and control hot spots in part 1 crimes, part 2 crimes, and crime-related calls for service. However, results showed a statistically significant reduction in crime-related calls for service in urban locations relative to suburban locations.

This is a group mentoring program that seeks to reduce recidivism of youth on probation in New York City, using an interactive journaling curriculum based on cognitive-behavioral principles. The program is rated Ineffective Program participants showed a statistically significant reduction in felony reconvictions, compared with comparison group youth at 24 months; however, there were no statistically significant differences on arrests, felony arrests, or reconvictions.

Police body-worn cameras (BWCs) are designed to improve policing and the perceived legitimacy of the police and legal institutions. The program is rated Ineffective There were no statistically significant differences in police use of force, number of citizen complaints, or number of arrests for disorderly conduct for police officers who wore BWCs, compared with officers who did not wear BWCs.

This is a temporary outdoor street-lighting program designed to reduce nighttime crime in public housing developments experiencing elevated crime rates. The program is rated Promising. Installing additional light towers in treated developments resulted in statistically significant reductions in complaints of index crimes, felony crimes, assaults, homicides, and weapons crimes at night, compared with control developments. There were no statistically significant differences in misdemeanor crimes.

This is a focused deterrence intervention that uses a data-driven approach to reduce shootings in Chicago, IL by identifying persons who are responsible for a disproportionate share of shootings and delivering a “don’t shoot” message. The program is rated Ineffective. The preponderance of the evidence suggests that the strategy had no impact on shooting behaviors in the year after the call-ins, but did have a statistically significant impact on the time until a shooting incident occurred.

This program relies on hot spots policing strategies to prevent thefts from vehicles and residential burglaries in “micro-time” hot spots in Port St. Lucie, Florida. The program is rated Effective. There was a statistically significant reduction in thefts from vehicles and residential burglaries in micro-time hot spots that received tactical police responses, compared with micro-time hot spots that received police patrol as usual.

This is a focused deterrence violence-reduction strategy. The goal was to lower the city’s exposure to violent crime, including reducing the numbers of homicides and aggravated assaults committed by chronic violent individuals operating within organized groups and other social networks. The program is rated Ineffective. Two years postimplementation, there was no statistically significant impact on homicides, group-member-involved homicides, and aggravated assaults.

This is a focused policing strategy to reduce calls for service and crime in hot spots using increased foot patrols by civilian police community support officers. The program is rated Ineffective. Hot spots that were assigned civilian proactive police community support officers did not experience statistically significant reductions in calls for service or crime.

An FBI-led, anti-gang strategy in Los Angeles, California, designed to reduce neighborhood-level violent crime through the identification, disruption, and dismantling of violent street gangs. This program is rated Effective. Results indicated a statistically significant 22 percent reduction per month in violent crime between the treatment areas and the comparison areas.

This intervention used two hot spots policing strategies (problem solving and directed patrol) to improve citizens’ perceptions of police in St. Louis, Mo. The program is rated Ineffective. Although residents in both treatment groups reported a statistically significant increase in cooperation with the police, the preponderance of evidence suggests that the intervention had no significant impact on citizens’ perceptions of procedural justice, police legitimacy, or police abuse.

Police body-worn cameras are used to record police encounters with citizens during officers’ shifts in Birmingham South. Officers were instructed to begin recording as soon as they left their vehicles and to conclude recording once the situation was resolved. The program is rated Promising. There was a statistically significant reduction in officers’ use of force and citizen injury, but no statistically significant reduction in officer injury.

This is a policing strategy in which officers may stop and detain an individual if they have reasonable suspicion that the person is committing or about to commit a crime. The program is rated Promising. Significant effects were found on measures of non-traffic-related crime incidents in three of the five boroughs of New York City. A U.S. Federal Court ruled that stop, question, and frisks as implemented were unconstitutional and appointed a special monitor to institute substantive reforms.

This is a court-based, pretrial, GPS supervision intervention for defendants arrested for intimate partner violence offenses. The program is rated Ineffective. Program participants showed no statistically significant reductions in risk of rearrests, domestic rearrests, or failure to appear in court. However, the program did show statistically significant reductions in defendants’ risk of failure to appear at meetings with pretrial services.

This program is designed to deter street-level crime in Newark using closed-circuit cameras, hard-wired to physical structures, which are monitored in real time by CCTV operators. The program is rated Ineffective. Results from one study showed no statistically significant differences in shootings, auto thefts, or thefts from autos. Results from a second study showed a statistically significant decrease in auto thefts but no statically significant difference in shootings or thefts from auto.

This is a cognitive–behavioral therapy program, consisting of 14 sequential classroom lessons, for high-risk persons on probation and delivered by probation officers in a community correctional environment. This program was rated Ineffective. Results indicate that participants had a statistically significant lower recidivism rate, measured as committing any new offense compared with nonparticipants, however, no statistically significant differences were found across individual offense types.

This program combines enhanced employment opportunities and wraparound services for incarcerated persons before and after release from prison. The program is rated Promising. There was a statistically significant reduction in likelihood of rearrests for program group participants, compared with the control group. There was also a lower rate of reimprisonment for program participants than nonparticipants; however, this difference was not statistically significant.

This program aims to improve police officers’ forensic evidence-collection techniques at burglary crime scenes to increase solved burglaries. The program also intends to improve police–victim and police–witness interactions at burglary crime scenes. The program is rated Promising. Results showed a statistically significant increase in solved burglary cases.

This is a criminal investigation method used by law enforcement to increase burglary arrest rates using statistically derived profiles of convicted persons. The intervention was implemented in one police department in Florida for use in active burglary investigations. The program was rated Effective. Results showed a statistically significant increase in burglary arrest rates for the police department that implemented the program.

This program involved officers patrolling crime hot spots in roughly 15-minute intervals to reduce crime. The program is rated Promising. There were statistically significant reductions in aggregated Part 1 crimes and Part 1 property crimes in the treatment hot spots, compared with control areas, during the 90-day intervention period, when compared with the same period 1 year prior. However, there was no statistically significant effect on calls for service, soft crime, and Part 1 violent crimes

This program provides an alternative to juvenile court processing for youths with justice system contact who may or may not have a criminal record. The program is rated Promising. Although there was no statistically significant difference between the treatment and comparison groups on rates of official police contact, the average number of days to re-arrest was statistically significantly lower for the treatment group (441.7 days) than for the comparison group (254.1 days).

A warning banner was presented to unauthorized computer system trespassers each time a computer system was illegally infiltrated, to deter further engagement with the attacked computer system and to prevent subsequent infiltration. The program is rated Ineffective. Across multiple studies, results showed that the intervention did not deter trespassers from engaging with the computer system; however, there was a small, statistically significant effect on the duration of trespassing incidents.

This was a registration requirement targeting individuals convicted of sex offenses and other crimes against children. The federal legislation required the registration of people released after serving time for a sex offense, including name, address, sex crime committed, and a photograph. The program is rated Ineffective. The program did not statistically significantly reduce sex-crime rates.

This was a reentry program in which individuals returning from prison were ordered by their parole or probation officers to participate in a 1-hour meeting within 90 days of their release. The meetings were meant to convey an intolerance for violence in the community and to allow the individuals to connect with service providers. The program is rated Ineffective. The program was shown to have no statistically significant effects on the likelihood of rearrest and the time to rearrest.

This program examined whether access to deployment data collected through technology impacted police commanders’ management of resources and led to reductions in crime. The program is rated No Effects. There was a statistically significant decrease in crime at the hot spot level. However, there were no significant differences in crime at the beat level, in consistency between patrols assigned and delivered per beat and per hot spot, or in number of hours of patrol on beats or in hot spots.

This was a residential treatment program that targeted individuals who committed multiple driving-under-the-influence (DUI) offenses. The program combined educational components with individualized treatment and therapy to address substance use. The program is rated Promising. The treatment group was statistically significantly less likely than the comparison group to be arrested for any new offense and specifically for a DUI offense, but not for committing an alcohol-related offense.

This is a community notification program targeting people who have been released after serving time for sex offenses in Minnesota. This is a state response to the federal requirements of Megan’s Law and authorizes law enforcement to notify local communities about where people who have been released after serving time for sex offenses will be living. The program is rated Promising. The experimental notification group had lower recidivism rates for sexual crimes compared with the non-notification

The program is a component of the San Juan County (N.M.) DWI First Offenders Program, which was designed to reduce driving while intoxicated (DWI) recidivism, alcohol consumption, and drinking and driving behavior by exposing them to testimonials from victims of drunk-driving accidents. The program is rated Ineffective. No statistically significant differences were found between VIP and no-VIP program participants on DWI recidivism over 2 years, and on various measures of drinking.

This program equips individual police officers in Rialto, Calif., with body-worn cameras to record police encounters during shifts. The program aims to reduce use-of-force incidents and citizen complaints by increasing mutual accountability. The program is rated Promising. There was a statistically significant reduction in police use-of-force, but no statistically significant difference in citizens’ complaints.

This focused deterrence strategy in New Orleans, Louisiana, aims to reduce gang violence and homicide. The program is rated Effective. There were statistically significant reductions found in overall homicide, firearm-related homicide, gang member-involved homicide, and firearm assault from the pretest to the posttest period. Further, New Orleans showed significantly decreased homicide rates after the program was implemented, compared with 14 cities with similar violent crime rates.

The program involved incorporating elements of procedural justice into traffic stops in Adana, Turkey, to test whether procedural justice improves citizens’ perceptions of the police and the law. The program is rated Ineffective. No statistically significant differences were found between the treatment and control groups on general perceptions of the police, but the study did find statistically significant differences between the treatment and control groups in encounter-specific perceptions.

This experiment assessed the impact of two hot spots policing tactics on firearm violence. The program is rated Promising. Compared with comparison hot spots, hot spots that received self-initiated enforcement experienced a statistically significant reduction in firearm assault rates, but there were no statistically significant differences for hot spots that received directed patrol. There was no statistically significant effect on firearm robbery rates between treatment and comparison hot spots

This is a law-enforcement model in which both location-based crime and automobile crash data is analyzed to determine where such incidents disproportionately occur (“hot spots”) and to employ targeted traffic enforcement strategies. The program is rated Promising. The areas of targeted enforcement experienced statistically significant declines in robberies, burglaries, and traffic crashes.

This strategy is aimed at reducing crime at violent-crime hot spots in Philadelphia, Pa., through police foot patrols. It involved having veteran officers patrol areas (an average of 3 miles of streets) during one shift per day. This program is rated Ineffective. Relative to the control areas, increasing foot patrols at violent-crime hot spots had no statistically significant impact on violent crimes, violent felonies, or citizens’ perceptions of crime and safety.

The program tested whether police use of a specialized script (based on principles of procedural justice) during random breath-test traffic stops could improve perceptions of police and change people’s views about drinking and driving. The program is rated Promising. The program was shown to have a statistically significant effect on changing views on police and on drinking and driving, on increasing satisfaction and compliance with police, and on strengthening perceptions of procedural justice.

This program is a multi-agency initiative to reduce gun violence in large cities through enhanced enforcement and deterrence. The program is rated Promising. Cities that received the program experienced a statistically significant reduction in violent crime, compared with control cities, between 2000 and 2006.

This is a seat-belt-enforcement campaign initiated and funded by the National Highway Traffic Safety Administration. The overall goal is to improve road safety by requiring drivers and passengers in vehicles to properly wear their seat belts. The program is rated Promising. There was a statistically significant decrease in motor vehicle accidents, but no impact on non-fatal injuries caused by vehicle accidents.

This program was implemented in three midsized cities near the Los Angeles, California area, with the goal of examining effects on residents’ fear of crime, perceptions of collective efficacy and police legitimacy, and actual and perceived levels of crime and disorder. The program is rated Ineffective. Findings revealed no statistically significant impacts on any of the dependent variables, suggesting no indication of either beneficial effects or “backfire” effects in targeted areas.

The program uses specially trained nurses to provide comprehensive psychological, medical, and forensic services to recent sexual assault victims in either hospital- or community-based clinic settings. The program is rated Promising. Across multiple sites, the results showed that sexual assault cases that were prosecuted following implementation of SANE had a statistically significant greater likelihood of resulting in a guilty plea or conviction.

This program seeks to reduce the recidivism of persons previously convicted of driving while under the influence of alcohol (DUI) through intensive testing and monitoring of drug and alcohol consumption. The main goal is to encourage sobriety of convicted persons 24 hours per day, 7 days per week. The program is rated Promising. The program led to a statistically significant reduction in repeat DUI and domestic violence arrests, but did not impact first-time DUI arrests or traffic crashes.

A problem-oriented policing strategy that aims to combat drug markets and the problems associated with them, in a high- crime neighborhood, through a deterrence-based, pulling levers framework. The program is rated Promising. The program was shown to significantly reduce nonviolent offenses in the target area, but not violent offenses.

This program monitors and tracks the movement of those on parole categorized as high risk for gang involvement or activity. The program is rated Promising. They are monitored by the GPS program had statistically significantly less arrests for new offenses and violent offenses, compared with control group people on parole. However, treatment group participants had higher odds of technical violations.

A crime prevention strategy designed to reduce crime in Washington Metropolitan Area Transit Authority parking facilities through the introduction of digital cameras at the exits of the parking facilities to capture images of patrons’ license plates as they exited the facility. The program is rated as Ineffective. Crime rates (including car-related, property, and violent crimes) remained at pre-camera levels in parking facilities.

This program aims to improve homicide clearance rates by increasing investigative time through the transfer of four crime scene specialists to the homicide unit. The program is rated Ineffective. There were no statistically significant differences between treatment and comparison squads in case and victim clearance by arrest. There were also no statistically significant difference between squads in case and victim clearance by quick action and whodunit arrests, or quality of scene reports.

A problem-oriented policing program that aims to eliminate overt drug markets and the problems associated with them through a deterrence-based, pulling-levers framework. The program is rated Effective. The Intervention had a statistically significant impact on reducing violent incidents in the target areas.

A program that attempts to reduce homicides and non-fatal shootings through a multidisciplinary and multiagency homicide review process. The program is rated Effective. There was a statistically significant, 52 percent, decrease, in the monthly count of homicides in the intervention districts.

This is a supervision program for high-risk youths. The program is rated Ineffective. Participants had a statistically significant decrease in the number of felony petitions, compared with the control group; however, there were no differences in petitions for new offenses, misdemeanor petitions, warrant status, days spent in custody, GPA, classes passed, classes failed, or number of days of school attended. There were also mixed findings on petitions for probation violations.

This is a school-based program on anger and aggression management for children and adolescents, especially those at risk for academic and behavioral problems. The program is designed to teach youth about emotions and help them recognize alternatives to violent behavior and aggressive responses. The program is rated Ineffective. There were no statistically significant differences between the treatment and comparison groups in anger control, state anger, or trait anger, at the 8-week follow up.

This program is a federal initiative under the U.S. Department of Housing and Urban Development, which began in 1992, to eradicate severely distressed public housing and to reconstruct sites with more livable housing. The program is rated Promising. The target sites experienced a statistically significant decrease in crime during the stability period (after redevelopment had taken place and most residents had moved into new units), compared with the comparison sites.

This is a public surveillance system that includes a network of cameras and components for monitoring, recording, and transmitting video images to monitor crime in different areas of Baltimore, Md. The program is rated Promising. There was a statistically significant decrease in total monthly crime in the downtown, Greenmount, and tri-district areas of Baltimore between pretest and posttest. However, there was no statistically significant difference in the North Avenue area.

This program consists of a judicial intervention, which seeks to improve the prosecution of gang-related crimes. The program is rated Promising. Treatment group cases were associated with a statistically significant greater number of convictions and incarcerations of gang members, and a lower number of case dismissals and rejections, compared with control group cases. However, there was no statistically significant effect on the rate of pleas.

This program consists of the use of a vehicle-scanning device deployed by law enforcement to detect vehicles that have been reported stolen or missing. The program is rated Ineffective. There were no statistically significant program effects on general crime, auto-related crime, vehicle-theft calls for service, or auto-theft.

This was a saturation foot-patrol initiative implemented in Newark, N.J., in 2008 that aimed to reduce violent crime. The program is rated Promising. The target area that implemented the initiative experienced statistically significant reductions in overall violence and incidences of aggravated assault and shootings, compared with the control area. However, there was no statistically significant effect on incidences of murder or robbery.

This is a community-based program that brings police, local government agencies, and the community together to prioritize problems and prevention efforts in Chicago, Ill. The goal is to solve neighborhood crime problems, rather than react to only to their symptomatic consequences. The program is rated Promising. Police beats or geographical units that implemented the program experienced a statistically significant reduction in crime and calls to 911, compared with police beats that did not.

This is a place-based, problem-oriented policing strategy implemented by the Boston (Mass.) Police Department in response to a sudden increase in violent index crimes. The program is rated Promising. Treatment street units experienced statistically significant reductions in total violent index crime, robbery, and aggravated assault, compared with control street units. However, there was no statistically significant effect on incidents of homicide or rape/sexual assault.

This is a comprehensive gang violence reduction program designed for the Little Village neighborhood of Chicago. The program is rated Promising. Treatment group youth who participated in the program had statistically significant reductions in total violent crime, serious violent crime, and drug crime arrests, compared with control group youth. However, there was no statistically significant difference in property crime arrests or total arrests.

This is a community program designed to reduce youth’s access to alcohol by changing community and law enforcement policies, attitudes, and practices. The program is rated Ineffective. There were no statistically significant differences between treatment sites and control sites in youth’s drinking prevalence, number of past-month drinking occasions, number of drinks consumed, attempts to purchase alcohol, or in alcohol merchants’ behavior.

This is a problem-oriented policing program that offered a collection of enforcement and non-enforcement strategies designed to reduce homicide in Richmond, Calif. The initiative combined traditional law enforcement practices with prevention and intervention efforts that involved partnerships with the community, other city agencies, and local schools. This program is rated Promising. There was a statistically significant reduction of homicides following the implementation of the initiative.

This police foot patrol strategy involved rookie officers patrolling an average beat of 1.3 miles during one shift per day in hot spots in Philadelphia, PA. This program is rated Effective. Compared with the control areas, there were statistically significant reductions in reported violent crime in patrolled areas, although the effect faded once officers were removed from their targeted beats.

This is a focused policing strategy, designed to reduce violent crime in high-crime locations in Jersey City, N.J., by modifying specific characteristics and situations that promote violence in targeted areas. The program is rated Promising. Total citizen calls for service and total reported criminal incidents were reduced in treatment locations, compared with control locations. These findings were statistically significant.

This program provides specialized and coordinated services to victims of sexual assault during their first contact with the health care system. The program is rated Promising. Treatment group patients had a statistically significant greater number of referrals to victim services and greater likelihood of consenting to evidence collection, pregnancy tests, and STD treatment, compared with control group patients treated in the standard emergency room.

This is a hot spots policing program that targeted identified drug activity locations to reduce public disorder by engaging local residents and business owners and applying pressure through crackdowns. The program is rated Promising. The treatment group hot spots showed a statistically significant decrease in disorder-related offenses, compared with the control group hot spots. However, there were no statistically significant differences in violent or property offenses.

This program consists of a structured interview protocol for professionals conducting forensic interviews with children in sexual abuse investigations. The program is rated Promising. Cases that followed the protocol showed a statistically significant greater likelihood of resulting in charges being filed, compared with cases that were handled prior to the protocol being implemented.

The program requires installation of ignition interlock devices in motor vehicles to test the breath–alcohol level of drivers convicted of alcohol-related traffic violations. The device prohibits alcohol-impaired drivers from starting and operating the vehicle. The program is rated Promising. Treatment group individuals who had the device installed had statistically significantly lower rates of rearrest for alcohol-related violations, compared with the control group, at the 3-year follow-up.

This program was designed to reduce driving under the influence (DUI) through installation of an ignition interlock device in motor vehicles of drivers convicted of alcohol-related traffic violations. The program is rated Promising. The treatment group had a statistically significant lower likelihood of being rearrested for DUIs, compared with comparison group participants, who served the typical license suspension and probation period.

This is a geographically focused policing strategy to reduce violent crime in high-crime areas using problem-oriented policing (POP) and saturation/directed patrols. The program is rated No Effects. While there were no statistically significant reductions in any violent or property crime in POP hot spots, or in any violence or property crime in directed patrol hot spots, there were statistically significant reductions in nondomestic violent crime in POP hot spots compared with control hot spots.

This is a crime-reduction strategy that uses a disorder-policing approach to improve physical and social order in high-crime locations in Lowell, Mass. This program is rated Effective. High-crime locations experienced statistically significant reductions in calls for service and in social and physical disorder, compared with control areas.

This is a problem-solving police strategy, which was designed to reduce gang violence, illegal gun possession, and gun violence in communities in Boston, Mass. The program is rated Effective. There were statistically significant reductions in youth homicide, citywide gun assaults, calls for service, and recovered new guns following implementation of the intervention.

A violence prevention program that uses a public health approach, using trained street violence interrupters and outreach workers, public education campaigns, and community mobilization to reduce shootings and killings. This program is rated Promising. The program was associated with significant reductions in shootings, killings, and retaliatory homicides and also appeared to make shooting hot spots cooler in some neighborhoods but not others.

This community crime-prevention program in Portland, OR., used a combination of private prevention techniques and neighborhood prevention efforts to protect neighborhoods from burglary. This program is rated Effective. Participating homes showed statistically significant reductions in burglary rates and were more likely to report burglaries to the police, compared with non-participating homes. However, there were no statistically significant differences in recovery rates of stolen property.

This program consists of installing closed circuit television (CCTV) cameras, to deter crime in five cities in England. The program is rated Promising. Intervention sites that installed CCTV cameras experienced a statistically significant reduction in assault-related emergency department visits, compared with control sites that did not install CCTV cameras. However, there was no statistically significant difference between intervention and control sites in police-reported violent offenses.

This is a place-based policing intervention that was designed to reduce crime and disorder associated with homeless encampments in the “Skid Row” section of Los Angeles, Calif. The program is rated Promising. The treatment group areas had statistically significant reductions in nuisance crime, violent crime, and property crime, compared with comparison group areas.

This is an automated ballistics imaging and analysis system that populates a computerized database of digital ballistic images of bullets and casings from crime guns, to assist forensic experts in making identifications for police investigations and trials. The program is rated Effective. There was a statistically significant 6.23-fold increase in the monthly number of cold hits generated by the Ballistics Unit after implementation of the automated ballistics imaging and analysis program.

This is a program that increased police presence in crime “hot spots” to reduce criminal activity in Minneapolis, Minn. The program is rated Effective. Experimental hot spots experienced statistically significant reductions in citizen calls to police and observed disorder, compared with control hot spots.

This is a brief early intervention and secondary prevention model, designed to prevent the development of chronic posttraumatic stress disorder (PTSD), for children aged 7–18 years who have recently experienced a potentially traumatic event. The program is rated Promising. Compared with the comparison group, the intervention group was statistically significantly less likely to have a PTSD diagnosis or receive a partial/full PTSD diagnosis; they also showed a lower severity of PTSD symptoms.

This mail campaign aimed to deter illegal firearm transactions in Los Angeles, Calif., using a letter outlining the regulations and laws surrounding firearm ownership. The program is rated Promising. Those who received a letter were more than twice as likely to report their firearms stolen than those who did not receive the letter. However, there was no statistically significant impact on whether the firearm was later used in a crime.

This was a special police unit that conducted raids of crack houses to reduce crack-related crime and improve public order in Kansas City, Mo. The program is rated No Effects. There were no statistically significant differences between the experimental and control groups in calls for service (including calls for violent, property, and disorder offenses) and reported offenses (including violent and property offenses).

This was an experiment to evaluate the impact of deoxyribonucleic acid (DNA) evidence collection and testing on the investigation of high-volume property crimes. The program is rated Effective. Across five sites, more suspects were identified, arrested, and prosecuted in the treatment group cases, compared with suspects in the control group cases. These differences were statistically significant.

This program consists of a specialized police unit, which was designed to prevent recidivism among people convicted of domestic violence offenses and to assist victims of domestic violence through the process of prosecution and recovery. The program is rated Promising. The treatment group assigned to the Domestic Violence Unit had a statistically significant lower likelihood of recidivating, compared with the control group, who were assigned to standard patrol.

This is a problem-oriented policing program targeted at high-crime areas and drug corners in Philadelphia, Pa., to prevent violent and drug-related crime. The program is rated Promising. Localized analysis of the intervention group areas (that implemented the program) found statistically significant reductions in violent and drug crime rates. However, there were no statistically significant effects on citywide homicide, violent crime, or drug crime rates.

The town of Redton, England, installed closed-circuit television cameras in the central commercial district to reduce crime. The program is rated Promising. Using a trend analysis, there was no significant overall crime decrease. However, in analyses of separate types of crime, controlling for trends, the reduction was significant for some types of crime (theft of and from vehicles), but not from others (other theft, shoplifting).

This is a reentry program in Brooklyn, N.Y., that provides substance abuse treatment, employment, and housing services for parolees. The program is rated Promising. Participants demonstrated a statistically significant lower likelihood of being rearrested or reconvicted, compared with the matched control group. However, there were no significant differences in employment and earnings, cohabitating with a partner and regular contact with their children, or drug and alcohol use.

This program consists of using closed-circuit television cameras in the town center and adjacent car parks, or parking lots, in Gillingham, England. The program is rated Promising. The treatment area where the cameras were installed experienced a statistically significant reduction in overall crime, compared with the comparison area.

These statewide drug court programs were designed to provide comprehensive management for persons convicted of drug offenses—through increased treatment, monitoring, and interactions with the court judge—to achieve reductions in reoffending and better drug treatment outcomes for substance users. This program is rated Promising. Individuals who participated in drug court programs had statistically significant reductions in recidivism rates and number of rearrests, compared with the control group.

This interagency public safety initiative aims to help incarcerated violent adults who have been convicted of a crime transition back to their neighborhoods following release from jail through various services. The program is rated Promising. The study found that after 3 years statistically significantly fewer program participants had been arrested for any crime and violent crime compared to the control group. The program was also associated with reductions in the subsequent overall time to arre

This is a multi-agency team-based, drug-control program in Oakland, Calif., which is designed to reduce drug-related problems and improve habitation conditions at targeted problem areas. The program is rated Effective. Treatment areas experienced a statistically significant decrease in police contacts following the implementation of the program.

This is a statewide sobriety deterrence program that seeks to combat impaired driving and reduce alcohol-related car crashes and fatalities in the state of Tennessee. The program is rated Promising. The program was found to have a statistically significant reduction on the number of drunk driving fatal crashes and nighttime single-vehicle injury crashes, compared with preintervention trends.

This program installed closed-circuit television cameras to monitor public space in different locations around the city of Philadelphia, PA. This program is rated Promising. The intervention showed a statistically significant reduction in disorder crime and the number of crime events in the target areas, compared with the control areas. However, no significant differences were found for serious crimes in the target areas, compared with the control areas.

This comprehensive 3-year program provides swift sanctions, intensive probation, close monitoring, and mandatory treatment for repeat impaired-drivers. The program is rated Promising. There were statistically significant differences between the treatment and comparison groups across all counties. The treatment group experienced lower DUI recidivism, driving with a revoked or suspended license recidivism, and any other traffic offense convictions.

This Maryland program was designed to decrease the number of subsequent alcohol-related traffic violations for drivers with multiple alcohol offenses. The program is rated Effective. Those in the ignition interlock group had statistically significant fewer subsequent alcohol traffic violations compared with the control group.

This is a program designed to reduce drug dealing at residential rental properties by encouraging improved property management practices. The program is rated Effective. The treatment group that implemented the full program experienced a statistically significant reduction in crime, compared with the control group However, there was no statistically significant difference between the treatment and control groups in the eviction of persons convicted of drug offenses.

This is a community-based approach to reducing and preventing crime while revitalizing the community. This program is rated No Effects. There were no statistically significant differences in rates of violent crime between the treatment and comparison areas following the crackdown. However, drug offenses increased significantly in the treatment areas, compared with the comparison areas.

This is a focused-deterrence policing initiative designed to reduce gun homicide in Stockton, Calif., by providing gang-involved youth with positive alternatives to violence. The program is rated Promising. The intervention was associated with a statistically significant 42 percent decrease in the monthly number of gun homicides, compared with pre-intervention trends.

This is a court program in western Michigan designed to divert people convicted of driving under the influence (DUI) from jail, eliminate substance use, and reduce recidivism. The program is rated Promising. At the 2-year follow up, program participants were less likely to be rearrested and had longer time to first-rearrest, compared with control group participants. These differences were statistically significant. However, there were no significant differences between groups for alcohol or drug

This was a policing initiative that targeted specific gangs in the Hollenbeck area of Los Angeles, California, through aggressive enforcement and problem-oriented policing. The program is rated Promising. There was a statistically significant reduction in overall violent crimes in targeted blocks, compared with matched comparison blocks. However, there was no statistically significant effect on gang crimes or gun crimes.

This is a policing program that used community mobilization, strategic planning, and pulling-levers notifications to reduce drug dealing in a high-crime area in Nashville, Tenn. The program is rated Promising. At the postintervention, there was a statistically significant decline in drug crime incidents in the target area, compared with the adjacent comparison area and the rest of Nashville. But there were no statistically significant effects on violent or property offenses or calls for service.

This is a policing program designed to reduce crime through the management of police resources in Fort Worth, Texas. The program is rated Promising. Following the implementation of Compstat in Fort Worth, there was a statistically significant reduction in rates of overall crime and property crime, and a statistically significant increase in arrests for minor nuisance offenses. However, there were no statistically significant effects on violent crime rates.

The program uses courts in a comprehensive approach to address the underlying causes of driving under the influence by aiming to change the behavior of alcohol and/or drug dependent individuals who have been convicted of drug/alcohol crimes. The program is rated Promising. The treatment group had a statistically significantly lower recidivism rate (measured as new court filings) and was statistically significantly more likely to fail sooner than the comparison group.