An influential literature has used the aftermath of terrorist attacks to estimate large effects of police street … circumstances. This paper exploits a natural experiment that aimed to increase police presence in more than 6,000 well-defined areas … by police officers, we first document exogenous and discontinuous changes in patrolling intensity. We do not find that …

How do changes in mobility impact crime? Using police precinct-level daily crime statistics and shootings data from the … mobility data aggregated at the police precinct level, we find that changes in mobility while the stay-at-home order is in …