Dalmata's exactly right. You can often "pass" these tests if you have a legal script of adderall, as they're able to tell whether it was a pharmaceutical or clandestine source (I believe it just costs extra money and a little extra time/attention, but don't quote me on that part).I've passed every drug test I've ever taken -- not that I've taken all that many, just random shit for employment -- and I was taking enough adderall those days to kill a small mammal. Didn't even get questioned about it any of the times, either.It's possible if it had been desoxyn (methamphetamine, not amphetamine), they would have marked me positive or just gotten all up in my face with questions and stuff. I'm not really sure. But they can tell the difference between pharmies and street gear, that much I know. You can't really do amphetamines of any kind at anything but very low levels -- perhaps even sub-clinical -- and expect to pass your drug test(s) reliably.