I've seen a documentary about
Jay Dobyn's infiltration of the Hell's Angels. He claimed that as a Federal Agent he was forbidden from using drugs at all during the investigation, and was forced to fake taking them at one point. He claimed a Hell's Angel instructed him to do a line of meth and that he pretended to take the line in such a way as he was able to cup the drugs into his hand. Who knows if this is true; I can't imagine when forced to choose between getting killed & jeopardizing the investigation, and breaking some rule of employment, too many agents would make the former choice.