York Regional Police say a 15-year member of the service has been arrested and charged with impaired driving.
According to a statement from investigators, the 35-year-old off-duty officer was pulled over on Clearmeadow Drive in Newmarket early Sunday.
After being requested to give a breath sample, police said he failed the roadside test.
Const. Ryan Harrison was charged with having more than 80 milligrams of alcohol in 100 millilitres of blood.
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Harrison previously worked in the guns, gangs and drug enforcement unit. Police said he has been off on a leave of absence since November.
News of the charge comes amid ongoing, high-profile initiatives by York Regional Police aimed at curbing impaired driving.