Research Resource

The research base on the impact of police body-worn cameras (BWCs) has grown rapidly, and over time, the results have become increasingly mixed. This development poses two problems: 

Though the research on BWCs has grown at an exponential rate over the past five years, there has been virtually no discussion about the training used by departments. This is a crucial oversight, given that any program or policy cannot succeed without effective training. We conducted an online survey of agencies receiving federal funds for BWCs to understand the type of training offered to officers, what this training entails, and how frequently training is provided. Responses from nearly 100 agencies indicate several key trends:

The 2017 National Academies of Sciences (NAS) Committee and Report on Proactive Policing highlighted what we know about the effects of proactive policing practices on crime prevention and police–community relations. However, the evaluation evidence reviewed by the NAS, which largely comes from case studies of carefully managed proactive initiatives, does not provide a basis for estimating how extensively these practices are used or whether they are used in the most effective ways.

In the past five years, body-worn cameras (BWCs) have disseminated widely and rapidly to police departments across the United States (White & Malm, 2020). In 2013, only one-third of agencies had some form of BWC program, most of which were small-scale pilot programs of the relatively new technology (Reaves, 2015). By 2016, about half of agencies had BWCs, including nearly 80% of large agencies (more than 500 sworn personnel) (Hyland, 2018). The push for BWCs came at a time when there was a severe dearth of research from which to draw guidance or best practices.

Contentious debate is currently taking place regarding the extent to which public scrutiny of the police post-Ferguson has led to depolicing or to a decrease in proactive policework. Advocates of the “Ferguson effect” claim the decline in proactive policing increased violent crime and assaults on the police. Although police body-worn cameras (BWCs) are touted as a police reform that can generate numerous benefits, they also represent a form of internal and public surveillance on the police.

Objectives The current research adds to the literature addressing police body-worn cameras (BWCs) by experimentally evaluating their effect on an interaction that has, to date, received relatively little systematic, empirical attention: police–eyewitness interactions. Although research suggests that BWCs generally have positive effects, legal scholars and media professionals have long argued that deploying cameras in this context may backfire, especially by chilling public willingness to speak with police.

Abstract: In this article, we provide the most comprehensive narrative review to date of the research evidence base for body-worn cameras (BWCs). Seventy empirical studies of BWCs were examined covering the impact of cameras on officer behavior, officer perceptions, citizen behavior, citizen perceptions, police investigations, and police organizations. Although officers and citizens are generally supportive of BWC use, BWCs have not had statistically significant or consistent effects on most measures of officer and citizen behavior or citizens’ views of police.

The value of body-worn camera (BWC) footage as evidence and the challenges and opportunities it affords case processing are, as yet, relatively unexplored. The current research examines the impact of BWC footage on prosecutors and defense attorneys in three jurisdictions: Monroe County, New York; San Diego County, California; and Travis County, Texas. We explore variations across the two groups (assistant district attorneys/public defenders) in terms of time, expectations, and anticipated consequences of BWC on their respective work in processing cases in local courts.

Abstract: Police departments use body-worn cameras (body cams) and dashboard cameras (dash cams) to monitor the activity of police officers in the field. Video from these cameras informs review of police conduct in disputed circumstances, often with the goal of determining an officer’s intent. Eight experiments (N = 2,119) reveal that body cam video of an incident results in lower observer judgments of intentionality than dash cam video of the same incident, an effect documented with both scripted videos and real police videos.

Abstract:  This article explores variations in procedural justice delivered in face-to-face encounters with citizens before and after the implementation of body-worn cameras (BWCs). We draw on recent advances in the measurement of procedural justice using systematic social observation of police in field settings in the Los Angeles Police Department.