A professional who investigates and apprehends persons suspected of illegal sale or use of narcotics, or violating anti-vice laws. Respnsibilities include:

• Examines prescriptions in pharmacies and physicians' records to ascertain legality of sale and distribution of narcotics, and determines amount of such drugs in stock.
• Investigates persons suspected of illegal sale or purchase of narcotics and arrests offenders.
• Investigates establishments and persons suspected of violating anti-vice laws, working as member of squad, and conducts or participates in raids of such establishments.
• Arrests suspects and obtains evidence to be used by district attorney in prosecuting case in court.
• Obtains statements for prosecution of offenders and appears in court as witness.
• Records progress of investigation and reports to superior.