Also: they might rat you out to the machine by proxy based on what drugs they proscribe or other conditions they apply if they feel you "abuse" drugs, which means a different thing to every shrink, and you don't get to know until it's too late. Get yourself a nice "drug abuser" flag in your file because you like weed or MDMA, and maybe you can't get real pain-killers later when you fuck your back up.