They ask other people for their pee and they take it with them and that's how they pass it. There's other ways, but they are risky and maybe won't even work. It also depends on what type of drug they took.
that's easy... How is it even possible to FAIL a drug test without drugs. next time actually put a little thought process into wording your question there is no way to magically just pass a drug test...
If you test positive for a drug but have a scrip for that drug all you have to do is prove that you have the scrip and you will pass because if ya got a scrip its not illegal.