Drug tests depend on the nature of the injury. When I hit my head on a locker door and ended up with a severe concussion (dont be rushed when things are open above you) I had to do a drug test. When a tm cut their dumb self with a pair of scissors they had to do a drug test. When a box fell on a tm in the back room thanks to idiot backstocking they didnt have to do a drug test. I think they hase it on circumstance on whether or not your faculties could have been compromised for better sense.