By Cecilia Hansen Löfstrand, Christel Backman

This review paper critically examines the work environment implications of the use of body-worn camera (BWC) technology reported in research. We found that published peer-review studies (90 articles) pay very little attention to the work environment of BWC users – police officers. Departing from the notion of the two faces of surveillance and of BWC technology as a surveillance tool with uncertain implications – control or protection of officers – we critically examine how expectations in relation to BWC introduction and its implications have been addressed to explain why so little attention has been devoted to the topic. We found a dominant control rationale facilitating (rapid) BWC implementation at the expense of officers’ work environment, health and safety.

New Technology Work and Employment, Volume36, Issue3 November 2021 Pages 327-347

By Sunyoung Pyo

The national debate about police use of force against racial minority residents has led to increased attention to body-worn cameras (BWCs) as tools for increasing police accountability. Although researchers have documented the effectiveness of BWCs, little research has been done to examine why police departments decide to use them in the first place. Based on an innovation framework, the current study aims to explain what factors determine police departments’ decisions to implement BWCs. By examining 139 U.S. police departments using event history analyses, I find that the police departments with a higher severity of police-involved deaths of minority residents and a higher strength of social movements protesting police brutality are more likely to implement BWCs. In addition, some organizational and environmental factors, including the availability of federal grants and the council-manager form of government, have significant associations with BWC implementation. Findings also suggest that different patterns of BWC implementation are demonstrated according to environmental context.

Urban Affairs Review, 58(1), 258-289. 2022

By Daniel AC Barbosa Thiemo Fetzer Caterina Soto & Pedro CL Souza

We provide experimental evidence that monitoring of the police activity through body-worn cameras reduces use-of-force, handcuffs and arrests, and enhances criminal reporting. Stronger treatment effects occur on events classified ex-ante of low seriousness. Monitoring effects are moderated by officer rank, which is consistent with a career concern motive by junior officers. Overall, results show that the use of body-worn cameras de-escalates conflicts

Warwick Economics Research Papers . Coventry, UK: University of Warwick, 2021. 56p.

By The St Louis Cty Police Dept

Spurred in part by a 2021 grant from the Bureau of Justice Assistance (BJA BWCPIP Grant # 15P BJA-21-GG-04437-BWCX), Missouri’s St. Louis County Police Department (SLCPD) expanded and refined its body-worn camera (BWC) program, acquiring an additional 100 BWCs to expand deployment to all sworn personnel. Concurrently, SLCPD developed helpful applications around their BWCs, integrating cameras from multiple sources into one readily accessible platform. Overall, the officers at SLCPD who spoke to CNA during a site visit in October 2022 feel the BWC system makes their jobs easier and increases personal safety. Department investment in the technical infrastructure as well as staff resources has allowed creative uses of the cameras and their data with practical results. Commitment and support from both the officers and the department leadership has led to a successful deployment of the camera systems. The integration of BWCs with automated license plate readers (ALPRs), Missouri Department of Transportation highway cameras, and other sources allows users to access video data from multiple sources. This integrated system, managed by the SLCPD Camera Systems Unit (CSU), turns SLCPD’s BWC system into an application that improves operations, efficiency, and officer safety. While automation helps efficiency in the field, the technology still adds labor hours and costs to handle the processing and storage of footage. According to SLCPD, the benefit of increased officer safety and the evidentiary value of BWCs are worth the operational and maintenance costs. The BWCs and their features have been used in several critical incidents to date. The footage often makes investigations more efficient because of the added digital evidence and saves time spent testifying in court. SLCPD has also used BWC footage in press releases, highlighting officers’ actions in the field.

Clayton, MO: St. Louis Police Department, 2023. 5p.

By Taeho Kim

Body-worn cameras (BWCs) have received extensive attention as a key reform to restore police legitimacy. I study the causal effects of BWCs on law enforcement outcomes by conducting a nationwide study of BWCs across 947 agencies that adopted BWCs between 2014 and 2016 in the US. I find that BWCs led to decreases in the use of force but the increased oversight did not reduce crime control activities. By examining social media usage from Twitter, I also find suggestive evidence that BWC adoption has improved public opinion toward the police.

Unpublished paper, 2019. 84p.

By Cynthia Lum, Christopher S. Koper, David B. Wilson, Megan Stoltz, Michael Goodier, Elizabeth Eggins, Angela Higginson, Lorraine Mazerolle

Body-worn cameras do not have clear or consistent effects on most officer or citizen behaviors, but different practices need further evaluation. Law enforcement agencies have rapidly adopted body-worn cameras (BWCs) in the last decade with the hope that they might improve police conduct, accountability, and transparency, especially regarding use of force. Overall, there remains substantial uncertainty about whether BWCs can reduce officer use of force, but the variation in results over studies suggests there may be conditions in which BWC could be effective. BWCs also do not seem to affect other police and citizen behaviors in a consistent manner, including officers’ self-initiated activities or arrest behaviors, dispatched calls for service, or assaults and resistance against police officers. BWCs can reduce the number of citizen complaints against police officers, but it is unclear whether this finding signals an improvement in the quality of police-citizen interactions or a change in reporting. Research has not directly addressed whether BWCs can strengthen police accountability systems or police-citizen relationships.

Campbell Systematic Review, 2020. 40p.

By Anthony Braga; James R. Coldren Jr.; William Sousa; Denise Rodriguez and Omer Alper

This study reports the findings of a randomized controlled trial involving more than 400 police officers in the Las Vegas Metropolitan Police Department (LVMPD). The authors find that BWC-wearing officers generated significantly fewer complaints and use of force reports relative to control officers without cameras. BWC-wearing officers also made more arrests and issued more citations than their non-BWC-wearing controls. In addition, a cost-benefit analysis revealed that savings from reduced complaints against officers, and the reduced time required to resolve such complaints, resulted in substantial cost savings for the police department. Considering that LVMPD had already introduced reforms regarding use of force through a Collaborative Reform Initiative prior to implementing body worn cameras, these findings suggest that body worn cameras can have compelling effects without increasing costs.

Arlington, VA: CNA Analysis and Solutions, 2017. 80p.

By Charles M. Katz, David E. Choate, Justin Ready and Lidia Nuno

Police Department $500,000 to purchase, deploy and evaluate police body worn cameras. The design and implementation of the project included the purchase of 56 BWC systems and deploying them in the Maryvale Precinct. The implementation of the BWC’s occurred in one of the two Maryvale Precinct squad areas (aka target area). All officers assigned to the target area were issued the equipment and were provided training in its use, maintenance, and related departmental policy. This evaluation was conducted to examine the effect of implementing police worn body cameras on complaints against the police and domestic violence case processing and outcomes.

Our analysis of the camera meta-data indicated that only 13.2 to 42.2 percent of incidents were recorded by and BWV camera. Domestic violence incidents were the most likely to be recorded (47.5%), followed by violent offenses (38.7), back-up (37%), status offenses (32.9%), and subject/vehicle stops (30.9%). ..Regardless, the officer worn body cameras were found to be beneficial to the officers and the court in a number of ways. … BWC did not appear, however, to have an impact on suspect behavior as measured through resisting arrest charges.Additionally, we examined the impact of body worn cameras on domestic violence case processing. Analysis of the data indicated that following the implementation of body cameras, cases were significantly more likely to be initiated, result in charges filed, and result in a guilty plea or guilt verdict.

Phoenix, AZ: Center for Violence Prevention & Community Safety, Arizona State University. 2014. 45p.

By Cynthia Lum, Christopher S. Koper, David B. Wilson, Megan Stoltz, Michael Goodier, Elizabeth Eggins, Angela Higginson and Lorraine Mazerolle

Law enforcement agencies have rapidly adopted body-worn cameras (BWCs) in the last decade with the hope that they might improve police conduct, accountability, and transparency, especially regarding use of force. Overall, there remains substantial uncertainty about whether BWCs can reduce officer use of force, but the variation in results over studies suggests there may be conditions in which BWC could be effective. BWCs also do not seem to affect other police and citizen behaviors in a consistent manner, including officers’ self-initiated activities or arrest behaviors, dispatched calls for service, or assaults and resistance against police officers. BWCs can reduce the number of citizen complaints against police officers, but it is unclear whether this finding signals an improvement in the quality of police-citizen interactions or a change in reporting.

Research has not directly addressed whether BWCs can strengthen police accountability systems or police-citizen relationships. Overall, the way BWCs are currently being used may not substantially affect most officer or citizen behaviors. The use of BWCs does not have consistent or significant effects on officers’ use of force, arrest activities, proactive or self-initiated activities, or other measured behaviors. Nor do BWCs have clear effects on citizens’ calls to police or assaults or resistance against officers. Analysis suggests restricting officer discretion in turning on and off BWCs may reduce police use of force, but more assessment is needed.

Oslo, Norway: Campbell Collaborative, 2020. 40p.

By Morgan C. Williams Jr., Nathan Weil, Elizabeth A. Rasich, Jens Ludwig, Hye Chang, and Sophia Egrari

Body-worn cameras (BWCs) are an increasingly common tool for police oversight, accountability, and transparency, yet there remains uncertainty about their impacts on policing outcomes. This paper reviews what we know about the benefits of BWCs and how those benefits compare to the costs of this new technology. We make two contributions relative to existing research. First, we update prior meta-analyses of studies of the impacts of BWCs on policing outcomes to incorporate the most recent, and largest, studies carried out to date in this literature. This additional information provides additional support for the idea that cameras may affect a number of policing outcomes that are important from a social welfare perspective, particularly police use of force. Second, we carry out a benefit-cost analysis of BWCs, as financial barriers are often cited as a key impediment to adoption by police departments. Our baseline estimate for the benefit-cost ratio of BWCs is 4.95. Perhaps as much as one-quarter of the estimated benefits accrue to government budgets directly, which suggests the possibility that this technology could, from the narrow perspective of government budgets, even pay for itself.

Chicago: Becker Friedman Institute, University of Chicago, 2021. 32p.

By Suat Çubukçu, Nusret M. Sahin, Erdal Tekin & Volkan Topalli

Police body-worn cameras (BWCs) have been the subject of much research on how the technology’s enhanced documentation of police/citizen interactions impact police behavior. Less attention has been paid to how BWC recordings affect the adjudication of citizen complaints against the police. We employ citizen complaint data from the Chicago Police Department and Civilian Office of Police Accountability filed between 2012-2020 to determine the extent to which BWC footage enhances the efficacy of evidence used to formulate a conclusion of responsibility, and whether bias against complainants based on race would subsequently be reduced. Accordingly, we exploit the staggered deployment of BWCs across 22 Chicago police districts over time to estimate the effect of BWCs on these outcomes. Our findings indicate that BWCs led to a significant decrease in the dismissal of investigations due to insufficient evidence ("not sustained") as well as a significant increase in disciplinary actions against police officers ("sustained" outcomes”) with sufficient evidence to sanction their misconduct. We further find that disparities in complaints across racial groups for the “unsustained” category fade away with the implementation of BWCs.

Cambridge, MA: National Bureau of Economic Research (NBER), 2021. 43p.

By William Webster, Diana Miranda, and Charles Leleux

This report provides research findings from a rapid research project reviewing the use of Body-Worn Video (BWV) cameras in a policing context, with specific reference to police-citizen interactions and scrutiny mechanisms. The research was conducted in November and December 2021, using a methodology consisting of a literature review and a sequence of semi-structured interview with BWV experts. The research was undertaken with a view to providing advice and guidance to Police Scotland for the potential widespread future roll-out of BWV in Scotland. It is evident, from the research reviewed here, that BWV is being deployed internationally by law enforcement agencies and other public service providers. Typically, BWV is recognised to provide evidence of incidents, provide a level of personal protection and increased transparency in policing. The rationale for the use of BWV in policing is well established and is afforded a good level of public support. It is also evident, that across UK police forces there is differentiated use of the technology and associated governance mechanisms. In this respect, Police Scotland is in an advantageous position in that it can learn from what is perceived to be ‘best practice’ elsewhere in the UK and beyond. It is apparent that across the UK there are novel emergent mechanisms used to govern BWV in relation to scrutiny and accountability. These include dedicated Scrutiny Panels and practices referred to as random ‘dip sampling’, as well as dedicated codes of practice and use protocols. Here, it is suggested that Police Scotland review what other police forces are doing in this area and design processes that are compatible with Police Scotland’s institutional arrangements. The research presented here also suggests that BWV use protocols and data management procedures are established prior to the widespread deployment of the technology. One aspect in which published literature was lacking was in relation to the impacts of BWV on minority groups and ethnic minorities. Here, the evidence is mixed with some authors claiming BWV strained community relations, whilst others claimed BWV made police interactions more transparent. This points to both, a need for further research, plus the use of caution in the use of BWV in certain situations. It is also noted, that whilst there is a general level of public support for BWV, this relates primarily to basic BWV camera units and that this level of support cannot be assumed from more sophisticated data processes, such as those associated with face recognition and live streaming technologies. Here, it is recommended that Police Scotland implement mechanisms that ensure a degree of oversight and accountability in how BWV cameras are used. This can ensure legitimacy of use and facilitate public confidence in the use of the technology.

Edinburgh: Scottish Institute for Policing Research, 2022. 74p.