The agency's investigations function is assigned to the Detective Bureau under the supervision of Lieutenant Brandon Poel and Detective / Sergeant Marc Vanderstelt.  


Detective Todd Swanker and Detective Bruce Morningstar are assigned as case detectives. One officer is assigned to the West Michigan Enforcement Team (a regional drug task force). Detective Ryan Pieske is assigned to the Internet Crimes Against Children (ICAC) task force.


Members of the bureau are responsible for follow-up investigations and the collection, processing, and proper storage of evidence.  In addition, personnel cooperate with other agencies on special investigations of organized crime, narcotics, etc., and maintain all evidence and unclaimed property.