In January of 2020, the National Police Foundation (NPF), in partnership with Arnold Ventures, co-sponsored a one-day conference, “Police Body-Worn Cameras: What Have We Learned Over Ten Years of Deployment?” This forum explored what we have learned about body cameras—both through scientific research and law enforcement practice—in the years since their deployment, as well as considerations for future implementation.

Little is known about officer perceptions of body-worn cameras (BWCs), and whether perceptions change following implementation within their agencies. BWC deployment varies, with some agencies mandating officers to wear BWCs and others using volunteers. Researchers have yet to assess attitudinal differences between volunteers and mandated officers. This study addresses these gaps using data from an evaluation of BWCs in the Phoenix Police Department to examine officer perceptions of the utility of BWCs, perceptions of organizational justice, and support for using procedural justice.

The objective of this study was to examine differences in use of force by police patrol and specialized units, and the impact of body-worn cameras (BWCs) on use of force in these groups. We used administrative data from the Tempe (AZ) Police Department collected during a randomized controlled trial (RCT) of BWCs. t tests of means and ARIMA models were constructed to analyze unit-level variation in use of force. We found that Tempe officers in specialized units use substantially more force than patrol officers.

Video technology has been an important public safety tool for decades. From the earliest closed-circuit television (CCTV) systems in correctional facilities to in-dash cameras in police vehicles, video technology has been used to deter criminal behavior, document encounters or behaviors of interest, and to investigate and solve crimes. The current iteration of video technology in public safety is body-worn cameras (BWC). The use of BWCs dates back to 2005 when small-scale tests were conducted in police departments in the United Kingdom (Goodall, 2007).

By 2016, approximately one-half of American police agencies had adopted body-worn cameras (BWCs). Though a growing body of research has examined the impact of BWCs on outcomes such as use of force, complaints, and perceptions of police, few have considered how and why some agencies adopted BWCs, while others have not. With guidance from the diffusion of innovations paradigm, the current study explores variation in BWC adoption by police agencies.

This report serves as an addendum to our more extensive four-year policy analysis report. Refer to the larger report for a more detailed description of the methodology, selection of policy issues, and general policy trends. In this report, we explore whether there is variation in body-worn camera (BWC) policy positions across agencies of different sizes. For example, do departments with fewer than 25 officers address BWC policy issues such as activation and de-activation the way much larger agencies do?