Office of the City Clerk - Record #: F2021-68

• Record #: F2021-68
• Type: Report
• Status: Placed on File
• Intro date: 9/14/2021
• Final action: 9/14/2021
• Title: Inspector General's report on Chicago Police Department's use of ShotSpotter technology
• Sponsors: Dept./Agency
• Topic: CITY DEPARTMENTS/AGENCIES - Inspector General, - REPORTS - Miscellaneous

Date	Journal Page Number	Action By	Action	Result
9/14/2021	34236	City Council	Placed on File

OIG FILE #21-0707
CPD'S USE OF SHOTSPOTTER TECHNOLOGY

TABLE OF CONTENTS
EXECUTIVE SUMMARY|910|BACKGROUND|910|
SHOTSPOTTER ACOUSTIC GUNSHOT DETECTION TECHNOLOGY|910|SHOTSPOTTER NETWORK IN CHICAGO|910|METHODOLOGY 10

SHOTSPOTTER ALERT DATA 10
JOINING SHOTSPOTTER ALERT DATA TO INVESTIGATORY STOP REPORT DATA 11
DATA ANALYSIS 13

SHOTSPOTTER ALERTS: VOLUME AND DISTRIBUTION 13
SHOTSPOTTER ALERTS: INCIDENT DISPOSITIONS 14
INVESTIGATORY STOP REPORTS ASSOCIATED WITH SHOTSPOTTER ALERT EVENT
NUMBERS 16
INVESTIGATORY STOP REPORTS WITH "SPOTTER" AND/OR "SST" IN WRITTEN
NARRATIVE 18
CONCLUSION 22
APPENDIX A: SHOTSPOTTER ALERT INCIDENT DISPOSITIONS 23



TABLE OF FIGURES
FIGURE 1: SHOTSPOTTER GUNSHOT DETECTION TECHNOLOGY|910|FIGURE 2: TYPICAL PROCESS FROM SHOTSPOTTER ALERT TO CHICAGO POLICE ARRIVAL ON
SCENE ;.8
FIGURE 3: SHOTSPOTTER ALERTS BY CPD DISTRICT AND BEAT 13
FIGURE 4: SHOTSPOTTER ALERTS AND LIKELY GUN-RELATED CRIMINAL INCIDENT DISPOSITIONS
15
FIGURE 5: LAW ENFORCEMENT OUTCOMES DOCUMENTED ON INVESTIGATORY STOP REPORTS
MATCHED TO CONFIRMED SHOTSPOTTER ALERTS 16


ACRONYMS
CPD Chicago Police Department
MCC Municipal Code of Chicago
MJC MacArthur Justice Center
OEMC Office of Emergency Management and Communications
OIG Office of Inspector General
SDSC Strategic Decision Support Center
SST ShotSpotter Technology

OIG FILE #21-070/
CPD'S USE OF SHOTSPOTTER TECHNOLOGY

I. EXECUTIVE SUMMARY
Pursuant to the Municipal Code of Chicago (MCC) §§ 2-56-030 and -230, the Public Safety section of the Office of Inspector General (OIG) initiated an inquiry into the Chicago Police Department's (CPD) use of ShotSpotter acoustic gunshot detection technology and CPD's response to ShotSpotter alert notifications. As part of this ongoing inquiry, OIG has analyzed data collected by CPD and the City of Chicago Office of Emergency Management and Communications (OEMC) regarding all ShotSpotter alert notifications that occurred between January 1, 2020 and May 31, 2021, and investigatory ...