A professional who directs and coordinates activities of squad of law enforcement personnel engaged in investigating establishments and persons suspected of violating laws concerning gambling, liquor, narcotics, and prostitution. Respnsibilities include:

• Conducts raids upon suspect establishments and directs arrest of persons involved.
• Directs persons engaged in collection of evidence to be used in prosecuting arrested suspects.
• Evaluates work performance of immediate subordinates.
• May train subordinates newly assigned to investigation division in performance of duties.
• May prepare and maintain various activity and personnel reports and records.
• May maintain budget of money to be utilized in purchasing of narcotics from sellers to effect arrest.
• May be designated according to rank of officer in charge as District Lieutenant; Investigation Division Captain; Investigation Division Lieutenant; Investigation Division Sergeant.