Arrests

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 No Effects. 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 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 program provides calls to individuals who have been arrested and released while they wait to appear for arraignment, to remind them to appear on their scheduled court dates. The program is rated Promising. There were statistically significant reductions in failure-to-appear rates for individuals in all three treatment groups who received phone call reminders, compared with individuals in the control group who did not receive any reminder.

This program equips police with on-officer cameras to record their interactions with civilians. The program is rated No Effects. 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 is a focused deterrence police strategy that was designed to reduce gang- and group-related violence in Detroit, Mich. The program is rated No Effects. 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 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 program equips police with body cameras to record encounters with civilians. The program is rated No Effects. 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.

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 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 program equips police with on-officer cameras to record contacts with civilians. The program is rated Promising. Body-worn camera use resulted in statistically significant decreases in citizen complaints, and there were mixed results regarding camera use on arrest rates. There were no statistically significant differences in citizen resistance. There was a statistically significant increase in use of force, and less proactive, officer-initiated contact.

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 No Effects. 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 is a police-operated public surveillance program that seeks to reduce crime and increase crime clearances (i.e., arrests) by installing new closed-circuit television cameras at high-crime, high-traffic intersections in Milwaukee (Wis.). The program is rated Promising. Intersections in intervention areas where new cameras were installed had a statistically significant higher rate of crime clearances for all crime types, compared with intersections in comparison areas.

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 program was designed to “slow down” police officers’ thought processes during encounters with citizens. The program is rated No Effects. At the 6-week follow-up, treatment group officers were statistically significantly less likely to be involved in an incident in which physical force was used, but there were no statistically significant differences on the fraction of incidents that resulted in an arrest, the number of citizen complaints filed against the officer, and other outcomes.

Police body-worn cameras (BWCs) are designed to improve policing and the perceived legitimacy of the police and legal institutions. The program is rated No Effects. 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.

The program is designed to reduce officer use-of-force incidents and citizen complaints by providing body-worn cameras to officers in the Las Vegas (Nevada) Metropolitan Police Department. The program is rated Promising. There was a statistically significant reduction in police use-of-force and citizen complaints, and a statistically significant increase in arrests and citations for officers who wore the BWCs, compared with non-BWC control group.

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 No Effects. Two years postimplementation, there was no statistically significant impact on homicides, group-member-involved homicides, and aggravated assaults.

This was a policing strategy designed to reduce the severity of intimate partner violence and the rearrests of males who had been previously arrested for, or had admitted to, a first domestic violence offense and received a conditional caution. The program is rated Promising. Results indicated a statistically significant reduction in frequency and prevalence of rearrests of persons assigned to the treatment group compared with those assigned to the control group.

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.

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 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 is a pre-booking, community-based diversion program designed to divert those suspected of low-level drug and prostitution offenses away from jail and prosecution and into case management and other supportive services. The program is rated Promising. The intervention group had a statistically significant lower likelihood of having been rearrested, compared with the control group. However, there was no statistically significant impact on non-warrant rearrests.

This program consisted of a multi-agency partnership to prevent violence and reduce violence-related emergency room admissions in Cardiff, Wales. The program is rated Promising. The program showed a statistically significant reduction in the rates of total assaults, wounding assaults, and hospital admissions related to violence, compared with the comparison sites. However, there were no statistically significant differences between Cardiff and the comparison sites in the rate of common assaults.

An intensive community-based partnership between police and treatment providers in West Midlands that provided enhanced delivery and coordinated efforts and resources to high-risk individuals to reduce their offending behavior. The program is rated Promising. The program was shown to significantly reduce the average number of arrests for participants.

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.

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 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 program involved cooperation between police and prosecutors to increase the likelihood that high-risk individuals would be convicted and incarcerated. The program is rated Promising. The experimental group had a statistically significant greater likelihood of being sentenced to prison and having longer prison sentences, compared with the control group. However, there was no statistically significant difference for conviction rates between the groups.

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 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 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 nonprofit organization created by neighborhood property owners or merchants to provide services, activities, and programs to promote local improvements and public safety. The program is rated Promising. The treatment areas experienced statistically significant reductions in overall crime, serious crime, less serious crime, and arrests compared with the matched control group areas.