How Do Closed-Circuit Television Cameras Impact Crimes and Clearances? An Evaluation of the Milwaukee Police Department's Public Surveillance System

• NCJ Number: 306983
• Journal: Police Practice and Research Volume: 22 Issue: 2 Dated: 2021 Pages: 1171-90
• Author(s): Lily Robin; Bryce E. Peterson; Daniel S. Lawrence
• Date Published: 2021
• Length: 20 pages

Annotation

This study using quasi-experimental analyses to estimate the effectiveness of police-operated CCTV cameras in Milwaukee, Wisconsin, found (1) that treatment intersections experienced more crimes post-intervention than comparison areas; and (2) limited evidence that CCTV cameras improve clearances.

Abstract

This study using quasi-experimental analyses to estimate the effectiveness of police-operated CCTV cameras in Milwaukee, Wisconsin, found that treatment intersections experienced more crimes post-intervention than comparison areas, despite overall crime declines in Milwaukee during the study period, likely because camera operators were using them to detect incidents that would have otherwise gone unreported. The study also found limited evidence that CCTV cameras improve clearances. Most studies have focused on how cameras can deter crime. The Milwaukee Police Department strategically deployed their cameras in high-crime, high-traffic intersections to aid criminal investigations. This study examines the impact of CCTV cameras on crimes and crime clearances as well as the differential impacts of CCTV in three treatment groups: all intersections that received a new camera, intersections where new cameras were installed alongside existing cameras, and intersections where only new cameras were installed. The study used propensity score matching to create comparison groups of camera-free intersections, then employed difference-in-differences estimation with negative binomial and Poisson panel regression models to determine whether CCTV cameras have an impact on various categories of crimes and clearances. (Published Abstract Provided)