The Joliet Police Department Investigations Division is comprised of Criminal Investigations, the Evidence Unit, the Tactical Unit, and the Narcotics Unit. Personnel assigned to Investigations Division include a Deputy Chief, two Lieutenants, Sergeants, Detectives, Crime Scene Investigators, Officers, and professional staff.

Criminal Investigations

Criminal Investigations: 815-724-3020

The Criminal Investigations Unit is primarily responsible for the follow-up investigation of reported crimes. Detectives investigate assigned cases and are separated into 'General Assignment' and 'Special Assignment' which include:

•Arson Investigation
•Digital Forensics
•Domestic Violence
•Financial Crime
•Juvenile Sex Crimes
•Sex Offender Registration & Compliance

Other Investigations Division Units

•School Liaison & Youth Crime - A Joliet Police Detective is assigned as a full-time School Liaison Officer to each City of Joliet public high school (Joliet Township Central High School, Joliet Pathways Academy School, Joliet Township West High School, & Plainfield South High School). They investigate criminal offenses involving students, and are also specially trained Juvenile Officers.

•Criminal Intelligence - Manage data and disseminate critical intelligence within the Investigations Division and across other elements of the Joliet Police Department.

•Joliet Police Tactical Unit - Investigate criminal offenses related to warrants, fugitives, burglaries, robberies, and other violent crime.

•Joliet Police Narcotics Unit - Investigate criminal activity related to narcotics offenses.

•Tri-County Auto Theft Task Force Unit - Investigate criminal activity related to the automotive industry, including vehicular hijacking, “chop shops”, stolen vehicles, VIN and license alterations, and other related vehicle offenses in Will, Grundy, and Kankakee counties. 

•Joliet Metropolitan Area Narcotics Squad - Investigate criminal activity mainly related to narcotics offenses under the direction of the Illinois State Police. 

•Will County Police Assistance Team - Investigate criminal activity related to major criminal offenses under the direction of the Illinois State Police. 

•DEA Task Force - Investigate criminal activity related to narcotics offenses in partnership with the Drug Enforcement Agency. 

•FBI Fugitive/Violent Crime Task Force - Investigate wanted fugitives and violent crime in partnership with the Federal Bureau of Investigation.

•Chicago Regional Computer Forensics Laboratory Task Force - Investigate digital forensic related criminal offenses in partnership with the Federal Bureau of Investigation.