A friend was stopped without probable cause but has a misdemeanor warrant out for his arrest. First, was the stop legal just on the basis that the officer recoginized him and new he had a warrant? Second, the officer driving was a cadet, who was only to be observing not traffic stops. Is this legal for the cadet to go ahead with the stop on another officers request that was a passenger in the car? Should he file a motion to supress?