IA4

Internal Affairs, Unit 4 (IA4) is one of three anticorruption/professional standards units in the Lower Mainland Constabulary (LMC), part of the LMC's Directorate of Internal Affairs. Its commanding officer is Chief Superintendent Andrew Parker. It is the second-largest of the three operational units of Internal Affairs by number of personnel, and has its headquarters on the 11th floor of Marpole Station.

In addition to its professional standards/anticorruption investigational responsibilities, IA4 maintains the Lower Mainland Constabulary's principal confidential informant (CHIS) program, which includes recruiting, training and compensating informants, providing safe houses, required documents and mission equipment, and operating a vast decoy system.