The Investigation Division consists of two sub-divisions: the General Crimes Division and Narcotics Division.

The General Crimes Division consists of one detective who investigates an array of offenses, from burglaries and sex cases to fraud and homicides. The General Crimes Division also conducts follow-up investigations on felony reports taken by the Patrol Division, as well as prepares and completes cases for prosecution.

The Narcotics Division consists of one detective assigned to the Drug Enforcement Division and is responsible for the investigation and arrest for most drug-related crimes in the county. They employ many investigative techniques, such as undercover operations, managing confidential informants, and targeted street patrol.