Investigations Section


The Investigations Section is responsible for follow-up investigations for crimes reported to the Oak Brook Police Department.  The Investigations Unit obtains evidence for use in the apprehension and prosecution of law violators. A Support Services division commander supervises the unit consisting of one sergeant and five investigators.  



Detective Involvement
There are different ways in which a detective becomes involved in a case. After a uniformed officer receives a call, the report is written and the case is forwarded to the section. Some of the criteria used to determine which cases merit follow-up include suspect information, witness statements, vehicle information, physical evidence, method of operation, and crime patterns. Assignments are usually in the form of special cases to follow to conclusion, normally culminating in the preparation of cases for prosecution, although detectives may investigate general complaints.

Crimes They Handle
The tasks handled by the Investigations Division include the following:

  • Crimes Against Persons: Batteries, domestic violence, robberies, assaults, and death investigations.
  • Evidence Technician: Processes crime scenes; collects, evaluates and stores evidence; and is responsible for transferring the evidence to either local, state, or federal crime labs for the appropriate analysis.
  • Financial Crimes: Bank fraud, credit card fraud, check cases, and forgeries.
  • Juvenile Crimes: Crime in which the offenders or the victims are juveniles.
  • Property Crimes: Motor vehicle thefts, burglaries, thefts, and criminal damage to property cases.
  • Hit and Run Motor Vehicle Accidents.


Our investigators also participate in the Cook County Retail Organized Crime Task Force.  The CCROCTF works in collaboration with our private sector partners to uncover retail theft rings working throughout the Chicagoland area.