What impact do police have on de-escalating criminal activities? When police arrive at the scene of a crime faster, do they reduce the severity of the crime? Conventional wisdom indicates that faster response times decrease the severity of crimes. However, a naive analysis of police response times and the severity of crimes would be misleading, as police responses are prioritized based on the severity of the call for service. In this analysis we utilize both the quasi-random relationship between the timing of calls for service and the availability of law enforcement officers to analyze the relationship between response times and criminal severity.