You can get some cheapo test strips from the drug store or online, test yourself with that a few times the days leading up. Also, drink a LOT of water right before the test, like a full cup right when you wake up and pee as much as possible before going in. The idea is to dilute your urine as much as possible to make the test inconclusive, which most places call a pass. Careful with the fake stuff because it has to stay a certain temp to look real (keep it in your underwear against your pelvis if you go that route). I've had friends use the head shop "supplements" and the fake stuff and have passed, it really depends on the place. If you do pop positive you could say you visited a legal state in the past month where you tried it and act surprised that it still showed up. Good luck! Hope you get it!!