The appellant, a civilian, was stopped by military police on a public highway just outside a military base after being observed speeding on the base.
The officers noted signs of impairment and issued a breathalyzer demand, which the appellant refused.
He was acquitted at trial on the basis that military police were not 'peace officers' under the Criminal Code with respect to civilians.
The Court of Appeal overturned the acquittal.
The Supreme Court of Canada dismissed the appeal, holding that while military police do not have general peace officer status over civilians under s. 2(f)(i), they do qualify as peace officers under s. 2(f)(ii) when enforcing laws on a military base pursuant to the Defence Establishment Trespass Regulations.
The officers retained this authority when stopping the appellant immediately outside the base.