Do the Effects of Police Body-Worn Cameras on Use of Force and Complaints Change Over Time? Results From a Panel Analysis in the Milwaukee Police Department

Police body-worn cameras (BWCs) can help improve transparency, accountability, and policing behaviors. This study extends prior BWC research by using a panel analysis design with a measure of treatment duration to examine how the effects of BWCs change over time. Using data from the Milwaukee Police Department ( N = 1,009), we propose and test two competing hypotheses: The program maturity hypothesis suggests that BWCs will be more effective at reducing use of force and complaints over time, whereas the program fatigue hypothesis expects BWCs to be less effective the longer officers wear BWCs. We find that BWCs reduced complaints overall and that, over time, each additional month with a camera resulted in 6% fewer complaints. There was no overall relationship between BWCs and use of force, but our treatment duration model suggests that there was an immediate decrease in use of force incidents, followed by a gradual increase in subsequent months.

Community perceptions: procedural justice, legitimacy and body-worn cameras

PurposeThis paper explores community members' perceptions of the Milwaukee Police Department (MPD)'s body-worn camera (BWC) program, examining knowledge and support of the program and its impact on views of procedural justice and legitimacy.Design/methodology/approachA two-wave, online survey was administered to Milwaukee-area residents in the fall of 2017 and summer of 2018, yielding 1,527 respondents. Multivariate regression analyses focus on overall relationships between sociodemographic characteristics, community member knowledge of the program, procedural justice and legitimacy and support for BWCs.FindingsCommunity members are supportive of BWCs and view officers as procedurally just and legitimate; however, perceptions were significantly lower among Black respondents. Respondents with knowledge of the BWC program were more likely to view officers as procedurally just, but program knowledge did not increase support for it.Research limitations/implicationsPolice agencies may benefit from improving community awareness of their BWC program as knowledge of the program is positively linked to the views of departmental procedural justice and legitimacy. However, education efforts alone are not sufficient in improving police–community relations. Future research should examine how policing stakeholders can engage the community to build views of legitimacy associated with BWC policies.Originality/valueFindings provide insight into community member perceptions of a large BWC program in a major US city. Results demonstrate the relationship between knowledge of a department's BWC program and views of procedural justice and legitimacy and support for BWCs.

How do body-worn cameras affect the amount and makeup of police-initiated activities? A randomized controlled trial in Milwaukee, Wisconsin

Objectives Examine how the amount and makeup of police-initiated activities changed after the introduction of body-worn cameras (BWCs). Methods From May 21 to November 22, 2016, patrol officers and sergeants from the Milwaukee Police Department were involved in a randomized controlled trial. Through a stratified random sampling procedure, half the officers (n = 252) were assigned BWCs, while officers from the control group (n = 252) continued business as usual. The counts of proactive activities, which included a total count of self-initiated events, as well as traffic stops, business checks, subject stops, and park and walks, were examined using random-effects negative binominal panel regression analyses. The models included a unique measure of contamination to assess its impact on officers’ proactivity. Results BWCs had no impact on the total amount of officer-initiated activities, traffic stops, or business checks. Officers with BWCs conducted approximately 8% fewer subject stops and 23% more park and walks than those in the control group. In all models, contamination levels were significantly, positively associated with the number of proactive activities that were conducted; however, the size of this effect was very small. Conclusions Results suggest that BWC-wearing officers may be less likely to engage in proactive activities that are highly discretionary and that could potentially lead to confrontations with community members. As departments continue to develop BWC programs or fine-tune their existing BWC policies, more research is needed to understand the degree to which BWCs affect officers’ behaviors and interactions with the public.