Alcohol is a "drug" they don't test for which causes more problems than weed.
If it's legal they shouldn't be testing for it anyway
There are still those pesky Federal laws making MJ illegal. In addition to that, there are all manner of workplace safety laws (and liabilities) in play. If you had a clue, you'd already know that.
If you had a clue you'd know the levels that show up in a test don't mean you're high.
I'd rather hire someone who smokes a joint once in a while than a drunk.
"Workplace safety" is a BS excuse