Objectives

The New York City Police Department’s “Summer All Out” (SAO) initiative was a 90-day, presence-based foot patrol program in a subset of the city’s patrol jurisdictions.

Methods

We assessed the effectiveness of SAO initiative in reducing crime and gun violence using a difference-in-differences (DiD) approach.

Results

Results indicate the SAO initiative was only associated with significant reductions in specific property offenses, not violent crime rates. Foot patrols did not have a strong, isolating impact on violent street crime in 2014 or 2015. Deployments on foot across expansive geographies also have a weak, negligible influence on open-air shootings.

Conclusions

The findings suggest saturating jurisdictions with high-visibility foot patrols has little influence on street-level offending, with no anticipatory or persistent effects. Police departments should exercise caution in deploying foot patrols over large patrol jurisdictions.

中文翻译：

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纽约夏季徒步巡逻倡议的效果：差异化方法

目标

纽约市警察局的“ Summer All Out”（SAO）计划是在该市巡逻辖区的一部分中进行的为期90天的基于现场存在的步行巡逻计划。

方法

我们使用差异差异（DiD）方法评估了SAO倡议在减少犯罪和枪支暴力方面的有效性。

结果

结果表明，SAO举措仅与特定财产犯罪的显着减少相关，而与暴力犯罪率无关。在2014年或2015年，步行巡逻对暴力街头犯罪并未产生重大的孤立影响。在广阔的地理位置进行步行部署对露天枪击事件的影响也微不足道，可以忽略不计。

结论

研究结果表明，具有高可见性的徒步巡逻的饱和辖区对街头犯罪几乎没有影响，没有预期或持久的影响。警察部门在大型巡逻地区部署步行巡逻时应谨慎行事。