Manchester Criminal Investigation Unit is charged with the responsibility of conducting investigations of major crimes, crimes involving substantial follow up, and those cases assigned by the Chief of Police.

    The detective unit has an investigator who specialize in narcotic cases, juvenile cases, sexual assault cases, domestic violence cases, burglary and larceny cases, and many other cases involving further investigations. Also, serious misdemeanors requiring specializes knowledge are included in the investigator's caseload. The duties of the detective is crime scene processing, evidence collection, interviewing witnesses and suspects, preparing cases for prosecution, and assisting other law enforcement agencies in the prevention, detection of crime, and the apprehension of criminals.

    The investigative process usually starts with a patrol officer completing an initial crime report, and then is referred to C.I.U. Detective also investigates a large number of self-initiated cases.

    Detective Captain Bruce Troutman heads this unit and receives assistance from one patrol corporal when assistants is needed.