Department of Criminal Law and Criminology.
Law Hum Behav. 2021 Oct;45(5):427-439. doi: 10.1037/lhb0000462.
We assessed how police officers' review of body-worn camera (BWC) footage, either before or after writing an initial report, affects subsequent police reports.
We had competing hypotheses regarding the effect of BWC footage review before writing a police report on the total amount of information reported (Hypothesis 1) but expected it to increase "on-camera" details while reducing "off-camera" details (Hypothesis 2) and increase the accuracy of reports (Hypothesis 3). We predicted that footage review after writing an initial report would result in more complete and more accurate revised reports (Hypothesis 4).
We conducted a field experiment with 102 Dutch police officers taking part in a training exercise in which they responded, in pairs, to an emergency call about physical abuse. One of the pair members wore a BWC. After interacting with and arresting the suspect, the officers went into separate rooms to write individual police reports. One pair member first watched the BWC footage and then wrote the report (watch first condition); the other pair member first wrote the report, then watched the footage and could revise the original report (write first condition).
Surprisingly, reports in the watch first condition did not differ significantly in amount, observability on footage, or accuracy from original or revised reports in the write first condition. However, police officers in the write first condition significantly improved both the amount and accuracy of their reports after footage review, though effect sizes were small (amount: d = .13, 95% CI [.08, .18]; accuracy: d = .20, [.05, .36]).
We recommend that police officers watch BWC footage only after they have written down their memories of the incident. If they revise their report after watching the footage, they should clearly identify the revisions made alongside the source of those revisions. (PsycInfo Database Record (c) 2021 APA, all rights reserved).
我们评估了警察在撰写初始报告之前或之后查看随身摄像机（BWC）录像对后续警察报告的影响。
我们对在撰写警察报告之前查看 BWC 录像对报告总信息量的影响有相互竞争的假设（假设 1），但预计它会增加“镜头内”细节，同时减少“镜头外”细节（假设 2）并提高报告的准确性（假设 3）。我们预测，在撰写初始报告后查看录像会导致更完整和更准确的修订报告（假设 4）。
我们进行了一项现场实验，有 102 名荷兰警察参与了一项培训演习，他们两人一组对一起关于身体虐待的紧急呼叫做出反应。其中一名组员佩戴了 BWC。在与嫌疑人互动并逮捕嫌疑人后，警察进入单独的房间撰写个人警察报告。一组中的一名成员先观看 BWC 录像，然后撰写报告（先观看条件）；另一组的另一名成员先撰写报告，然后观看录像并可以修改原始报告（先写条件）。
令人惊讶的是，先观看条件下的报告在数量、录像可观察性或准确性方面与先写条件下的原始或修订报告没有显著差异。然而，在观看录像后，先写条件下的警察显著提高了报告的数量和准确性，尽管效应大小较小（数量：d =.13，95%CI [.08，.18]；准确性：d =.20，[.05，.36]）。
我们建议警察在写下对事件的记忆后仅观看 BWC 录像。如果他们在观看录像后修改报告，他们应明确标识所做的修改以及这些修改的来源。（PsycInfo 数据库记录（c）2021 APA，保留所有权利）。
