Police‐Monitored Cameras and Crime*
利用乌拉圭蒙得维的亚市街道层面的犯罪数据和摄像头安装信息，研究发现警方监控摄像头使监控区域犯罪率下降约20%，且未发现犯罪转移效应。
Abstract We study the effects of police monitoring on crime. We exploit detailed information on the location and date of installation of police‐monitored surveillance cameras, coupled with data at the street‐segment level on all reported crimes in the city of Montevideo, Uruguay. We find that the introduction of police‐monitored surveillance cameras reduces crime by about 20 percent in monitored areas relative to a pure control group located outside the city. We also explore potential displacement effects, and we do not find evidence of such effects.