Alright, by the time of my test I will be 16 days clean. Once again I am tall and skinny, but a heavy user. I was thinking about buying a drug test at walgreens, but it's 15 bucks for 1 test! I know I can get it cheaper online, but I can't buy it online, I have to in the store. So what do you guys think. 16 days clean with a naturally high metabolism. Should I just buy a test, piss in it the day before the actual test and if I pass that test just go and take the real test naturally doing nothing to it, or should I dilute or substitute? I was reading reviews for the drug tests and some people were saying it's innacuarte, the test saying they tested negative but when they did the real test they failed. Im just really nervous. Thanks a lot guys