We don't want people under influence of drugs on the range, and we have to keep an eye open..
Because, whos under influence of drugs? That person from the neighborhood that did " a couple of unwise things" as young? The person that is convicted for a drug related crime? That person you spotted on the town, that looked a little "weird" ? That person who hangs out with "those", or perhaps that well trained person with camo pants, tight t-shirt and sunglasses who is constantly grinding his teeth ?
Drugs/psychiatry and firearms is a bad mix, what if somebody goes mental and starts to see blue goblins everywhere ?
That could get really nasty!
here's a example