Objectives

This randomized experiment explored the impact of hot spots policing (HSP) strategies on criminal offenses and calls for service within chronic, persistent violent crime clusters in Las Vegas, NV.

Methods

Forty-four street segments were randomized into treatment (N = 22) and control (N = 22) conditions across nine chronic, persistent violent crime areas. The conditions (foot patrols, stationary patrol vehicles, and business-as-usual) were active for 6 months.

Results

Over 90% of the hot spots experienced an average of 1.5 h or greater of patrol dosage per day. In terms of impact, the mixed effects negative binomial regression results showed that the addition of HSP had a marginally significant reduction on overall crime (− 21%), a statistically significant reduction on overall calls for service (− 25.7%), and a statistically significant reduction of 34% on violent calls for service.

Conclusions

Reductions in crime and calls for service occurred in settings where enhanced patrol resources were already deployed. The findings did not demonstrate any evidence of a ceiling effect for HSP to impact crime and violence, even where additional patrol resources were already higher than normal.

中文翻译：

---

拉斯维加斯的热点警务：长期暴力犯罪地点随机对照试验的结果

目标

这项随机实验探讨了热点警务 (HSP) 策略对内华达州拉斯维加斯长期持续的暴力犯罪集群中的刑事犯罪和服务呼吁的影响。

方法

44 个街道路段被随机分为治疗 ( N  = 22) 和控制 ( N  = 22) 两个长期持续暴力犯罪地区的条件。条件（步行巡逻、固定巡逻车和一切照旧）活跃了 6 个月。

结果

超过 90% 的热点每天经历平均 1.5 小时或更多的巡逻剂量。在影响方面，混合效应负二项式回归结果表明，HSP 的加入对总体犯罪率有轻微的显着降低（- 21%），对总体服务需求有统计学显着降低（- 25.7%），以及在统计上显着降低显着减少了 34% 的暴力呼叫服务。

结论

在已经部署了增强型巡逻资源的环境中，犯罪率和服务需求减少了。调查结果并未证明任何 HSP 影响犯罪和暴力的上限效应的证据，即使额外的巡逻资源已经高于正常水平。