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Testing the effects of police body-worn cameras on use of force during arrests: A randomised controlled trial in a large British police force

机译：在逮捕期间测试警察佩戴的摄像机对使用武力的影响：大型英国警察部队的随机对照试验

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This study aims to assess the effect of body-worn cameras (BWCs) on police use of force, in a British police force context. We tested the effect of BWCs with a large British force in a six-month randomised controlled trial. Police shifts (n = 430) were randomly assigned on a weekly basis into treatment and control conditions. Odds ratios of use-of-force rates per arrests were used to estimate the causal impact of BWCs. Analyses of these odds for overall use of force and again within pre-specified force categories were conducted. Overall, we found a 50 percent reduction in the odds of force used when BWCs are present compared with control conditions. Our estimates suggest a 35 percent reduction of overall weighted force in the treatment conditions compared with control conditions. However, the effect concentrates in open-hand tactics (physical restraints and non-compliant handcuffing), with no discernible effect on categories of more aggressive force responses (for example, dogs, Tasers, batons, pepper spray); 40 percent ‘more force’ was detected in treatment conditions for handcuffing non-combatant suspects. We conclude that BWCs deter officers, offenders or both into complaint behaviour. Importantly, showing a conditional effect on force types can be further contextualised as enhanced transparency and accountability by the police, with greater reporting of use of force that would otherwise be concealed. Our findings illustrate the importance of analysing police use of force with and without compliant handcuffing of arrestees, which may or may not form part of the force continuum.
机译：这项研究旨在评估在英国警察部队背景下，随身摄像机（BWC）对警察使用武力的影响。在为期六个月的随机对照试验中，我们用一支大型英国部队测试了BWC的效果。每周将警察轮班（n = 430）随机分配到治疗和控制条件中。每次逮捕的使用武力比率的比值比率被用来估计BWC的因果影响。对总体使用武力的可能性以及在预先指定的武力类别中的可能性进行了分析。总体而言，我们发现与控制条件相比，存在BWC时使用的力的可能性降低了50％。我们的估计表明，与对照条件相比，治疗条件下总体加权力量降低了35％。但是，效果集中在开放手法上（物理约束和不合规定的手铐），对更具攻击性的力响应类别（例如，狗，泰瑟枪，警棍，胡椒喷雾）没有明显影响；在治疗条件下，将没有战斗能力的嫌疑犯戴上手铐后，发现有40％的“更多力量”。我们得出的结论是，《生物武器公约》会阻止官员，罪犯或两者同时陷入投诉行为。重要的是，显示出对部队类型的有条件影响可以进一步根据情况进行描述，因为警察可以提高透明度和问责制，并更多地报告使用武力的情况。我们的发现表明，分析警察使用武力时是否将被捕者戴上合规手铐，这一点很重要，这可能会或可能不会构成部队连续体的一部分。

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    Henstock D; Ariel Barak;

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