The Support Services Division is comprised of two separate units. They are Investigations and Proactive Policing. The Division is staffed by one Captain, who is the overall commander of the Division, two Sergeants, who each supervise one of the units, eight Investigators and three Officers assigned to the Special Investigations Unit (SIU). 

Investigations

The Investigations Unit at the Plymouth Police Department primarily handles criminal investigations that occur within the city.  The unit is supervised by a sergeant whose responsibility is to screen cases, assign cases to detectives for investigation, and manage/direct significant cases.  The unit has eight detectives who are mainly divided into two distinct categories: Person Crimes and Property Crimes.  Although detectives primarily have a specialty, all of our detectives are very talented general investigators and can investigate any cross-specialty case assigned to them.  Detectives also work with state and federal investigators as needed when cases become multi-jurisdictional or when further specialized resources are needed.

Two permanent detectives specialize in Person Crimes, which consists of crimes such as: Homicides, Assaults, Sex Crimes, Child Abuse, etc. 

Three permanent detectives specialize in Property Crimes, which consists of crimes such as: Theft, Fraud, Vehicle Theft, Gun Crimes, Computer Forensics, etc. 

Two detectives serve as rotating investigators for three years.  These detectives handle both Person Crimes and Property Crimes, and return to Patrol Officer duties upon the completion of their rotation.

One detective is assigned as a Background Investigator.  This position handles internal public safety employment backgrounding (police officers, fire fighters, etc.) and certain public frauds. 

Proactive Policing Unit

This unit includes the Special Investigations Unit (SIU) and Predatory Offender Compliance.

The department has three officers working in its Special Investigations Unit (SIU). This unit is designed to be proactive and works to resolve ongoing problems within the community. The officers review crime trends to address growing concerns and work to combat issues. They allow Plymouth Police to address chronic and predatory offenders and recurring problems within the community. They identify and focus attention on individuals who account for a disproportionate number of calls over the years and make strategic plans to modify their criminal activity.