It's funny how few people actually realize that a short detainment . . . which is what a traffic stop is . . . requires only reasonable suspicion and not probable cause. Years ago, I had a DUI arrest that ended with a criminal conviction with no issues. When it went to a subsequent administrative hearing to see if the guy would lose his license, it was thrown out because they ruled I didn't have probable cause to make the stop. Point being, even the DMV bureaucrat types, who are not law judges, had a fundamental misunderstanding of the law.