After a review of Chicago Police Department(CPD) and City of Chiacgo Office of Emergency Management and Communications(OEMC) data related to Shotspotter alerts, the Chicago OIG found that ShotSpotter rarely leads CPD officers to evidence of a gun crime or to the recovery of a firearm (P.3). The OIG report also identified evidence that ShotSpotter altered police behavior, changing the way officers “perceive and interact with individuals present in areas where ShotSpotter alerts are frequent.”