The
Ontario Provincial Police (
OPP) is the
Provincial Police service for the province of
Ontario,
Canada. In the late 1940s, policing functions were reorganized in Ontario, with the OPP given responsibility for all law enforcement in the Province outside areas covered by municipal police forces, together with overall authority for law enforcement on the
King's Highways, enforcement of the provincial liquor laws, aiding the local police and maintaining a criminal investigation branch.