This is an experiment designed to evaluate the effectiveness of selective patrol tactics in hot spots with a high incidence of gun violence. Officers assigned to selective patrol tactics were instructed to patrol slowly through the hot spot, avoiding initiating contact unless there was a crime in progress or the safety of a citizen or another officer was at risk.
Officers assigned to self-initiated tactics, in addition to patrolling slowly, could perform checks on pedestrians, buildings, and occupied and unoccupied vehicles, in addition to making arrests and solving problems. The experiment was limited to the 3AM-11PM and the 11PM-7AM shifts, when the frequency of gun violence was highest.