That sucks breh, but it happens. I'd always ask "what are the screening requirements for this position?" to try to figure out if a drug test is involved.
Best rule of thumb however is: if you are looking for a new job, cut the trees down or invest in something to cover yourself.
if i asked that do you really think they would have hired me in the first place?
cut down? invest in a cover? they said i tested at 3 times the level of a medical marijuana patient breh. ain't no hiding that