Report: increases in police use of force in the presence of body-worn cameras are driven by officer discretion: a protocol-based subgroup analysis of ten randomized experiments

Objectives

Our multisite randomized controlled trial reported that police body-worn cameras (BWCs) had, on average, no effect on recorded incidents of police use of force. In some sites, rates of use of force decreased and in others increased. We wanted to understand these counter-intuitive findings and report pre-specified subgroup analyses related to officers’ discretion on activating the BWCs.

Methods

Using pre-established criteria for experimental protocol breakdown in terms of treatment integrity, ten experimental sites were subgrouped into “high-compliance” (no officer discretion applied to when and where BWCs should be used; n?=?3), “no-compliance” (treatment integrity failure in both treatment and control conditions; n?=?4), and tests where officers applied discretion during treatment group but followed protocol in control conditions only (n?=?4).

Results

When officers complied with the experimental protocol and did not use discretion, use of force rates were 37 % lower [SMD?=?(?.346); SE?= .137; 95?% CI (?.614) – (?.077)]; when officers did not comply with treatment protocol (i.e., officers chose when to turn cameras on/off), use of force rates were 71 % higher [SMD?= .392; SE?= .130; 95?% CI (.136) – (.647)], compared to control conditions. When full discretion (i.e., overall breakdown of protocol) was applied to both treatment and control conditions, null effects were registered [SMD?= .009; SE=.070; 95?% CI (?.127) – (.146)], compared to control conditions.

Conclusions

BWCs can reduce police use of force when then officers’ discretion to turn cameras on or off is minimized—in terms of both case types as well as individual incidents. BWCs ought to be switched on and the recording announced to suspects at early stages of police–public interactions. Future BWCs tests should pay close attention to adherence to experimental protocols.

     

Child Protection Law as an Independent Variable

Child protection professionals work in a multidisciplinary system in which the law and the family court play central roles and which collects an increasing amount of data. Yet we know little about what impact the law has on whether a child is removed by child protective services, is deemed neglected by a family court, or reunifies with a parent. Do state‐to‐state variations in child protection laws, or changes by individual states to their laws, lead to different outcomes for children and families? The dramatic variations in child welfare practice from one state to another suggest that legal variations do matter. Yet empirical research on these questions is scarce both because we collect too little data to measure all such issues, and, because we have failed to study the data we do have. This article is a plea for researchers to rectify that problem and for policymakers to improve data collection. Doing so would facilitate a more clear understanding of the law's effect on child protection outcomes and aid policymakers and advocates in identifying both promising and problematic practices and legal reforms.