I've heard of some "situations" involving raves and outdoor parties where weed was involved, but in each case the foreigners get a free pass while the Chinese get to spend all night in a police station getting drug tests. Anyways, we will never be Chinese and won't see the real China.
These aren't regular police men, they are the police guys who are in plain clothes and drive black Audis. Quite a bit different from the regular traffic cop.