The investigative units that comprise the Department's Criminal Investigations Division are primarily responsible for the follow-up investigation of crimes committed against persons or property in the Village of Oak Lawn. Investigators assigned to this division conduct all major criminal investigations that are undertaken by the Village of Oak Lawn.
Investigators perform follow-up investigations of serious crimes i.e. Homicide/Assault, Robbery, Sex Crimes, Burglary, Larceny, and Auto Theft. The Tactical Investigations Section investigates narcotics and the organizations that support them. The Financial Investigations Unit looks into financial crimes such as forgery and deceptive practice.
The Juvenile Section brings together police resources focused on family and juvenile issues, Family Services and Peer Jury to name two. The Juvenile Investigations Unit is responsible for cases of missing, abused, and neglected children. A School Detectives Liaison provides security services and investigations to High School.