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理解枪支暴力事件后的警务活动:考察芝加哥的调查性盘查与犯罪

Understanding policing in the aftermath of gun violence: Examining investigatory stops and crime in Chicago
Journal of Public Economics · 2024 · William LeRoy

中文摘要

本文考察芝加哥警察在近期枪支暴力事件后进行的调查性盘查。本文采用交错双重差分设计,动态比较相邻警务辖区之间的盘查情况。在枪支暴力事件发生后的短期内,盘查总量上升,这与指数犯罪事件的减少相对应,并导致查获更多武器和/或违禁品。在随后一个月内,警察继续进行额外的盘查,但这些盘查在查获非法物品方面被证明是无效的,且似乎对犯罪没有影响。导致执法处置的盘查在枪支暴力事件发生三个月后仍持续存在。在帮派聚集程度较高的地区,针对非白人的盘查占基线盘查总量上升的很大一部分。

Abstract

I examine investigatory stops conducted by Chicago police officers following recent gun violence. I use a staggered difference-in-differences design to dynamically compare stops between neighboring police beats. In the immediate aftermath of gun violence, I find a rise in total stops that corresponds with a decline in index crime incidents and results in more seized weapons and/or contraband. Over the next month, officers continue to conduct additional stops, but these stops prove unproductive in yielding illicit goods, and seemingly have no impact on crime. Stops resulting in enforcement action persist three months after gun violence. Non-White stops in regions with considerable gang concentration account for much of the baseline rise in total stops.
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