I think it depends on the province in which the case occurs. There are some provinces where the police force has language obligations. For example, in New Brunswick where the RCMP acts as a provincial police force, the courts held that the RCMP needs to meet the criteria of New Brunswick rather than the federal linguistic criteria. So they have language obligations from the point at which they pull a car over to the side of the road. There are other provinces where that obligation does not exist.
I have sometimes wondered whether in fact some language activists in different provinces engage in their activism by speeding, when you consider the number of speeding tickets that have led to Supreme Court decisions on language rights. We have such an asymmetrical language system that the obligations involving police forces in western Canada, for example, are very different from what they are in New Brunswick.