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This study assessed the early deployment of the Anaheim Police Department’s body-worn camera (BWC) program in 2015 by examining camera activations across officers, trends in activations over time, and how different police–community contacts predict BWC activations. These were assessed with correlational analyses among 40 BWC-equipped officers in the first 6 months of their use. Activation of the BWCs among officers varied widely, with 6-month average activations ranging from 0% to 72%. Average activation rates increased over time from 3% to 54%. Officers disproportionately activated their cameras for events related to crimes; for example, activation rates for other categories were significantly lower compared to violent crimes, with odds ratios ranging from 0.148 to 0.663. The article concludes with a discussion on how the failure to activate a BWC limits the potential benefits of the technology. While officers have considerable discretion on when to activate their BWCs, law enforcement agencies must not only train and deploy BWCs among their officers but also audit and supervise individual use to ensure successful BWC programs.

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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.

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