In most provinces cops have a right to randomly select and pull anyone and proceed to inspection. If they have the slightest hint that something's wrong, they'll proceed and be in their right to do a search (not talking about stripping down the car as it sometimes happens at the borders but visual inspection).
It can be just to check that the driver/passengers are all ok, that no prohibited items are in the car or that the car is mechanically safe for it to be on the road.
Source: RCMP trooper friend - Then again, what he told me was not the equivalent of a law book, so one would have to take this statement with a grain of salt. That being said, it does show that they might have more rights and means that some of you seems to think
Originally Posted by Brian McIlmoyle
Real life comparison,
GBBR- bang bang -- Giggle
AEG-- merrrzip merrzip -- meh