Snowmobile Trail Officer Patrol (S.T.O.P.) is a partnership between the Ontario Provincial Police and the Ontario Federation of Snowmobile Clubs. In the Durham Region, the police partner is the Durham Regional Police Service. This community based enforcement program uses the assistance of Special Constables to better the sport of snowmobiling. The goals of the S.T.O.P. program are to;

They also assist police in sobriety enforcement. For MSVA enforcement purposes, S.T.O.P. Officers have the same authority as police officers.

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This authority comes from the Police Services Act and is granted by the government. This gives a S.T.O.P. Officer special powers for the Province of Ontario only to enforce the Motorized Snow Vehicles Act (M.S.V.A.) only for a set period of time.

The power to write tickets comes from the Provincial Offences Act Section 1(3) and the designation of Special Constables is signed by the Solicitor General. This permits the Commissioner of the O.P.P. to appoint the S.T.O.P. Officers as Special Constables. The O.P.P. Provincial Coordinator holds the signed designation in Orillia empowering the S.T.O.P. Officers to be appointed as Special Constables to enforce the M.S.V.A.

Therefore under the M.S.V.A. a S.T.O.P. Officer can carry out the same duties as a Police Officer by definition (Sec. 53 (3) Police Services Act) and may even make an arrest under Sec. 16(5) of the M.S.V.A.