stempius,

They will not ask you any questions about medication at the lab. I take a medication legally that fails a drug test. When they called me (assuming to tell me I failed the test) they first asked me if I took any medication. I told them, then they just needed proof that it was my medication.

As for the 2nd hand smoke thing, if you're job bought they, they aren't very bright.

swifty,

Drinking that much water that early before the test does no good. Just make sure to read the directions and hope for the best. It failed me, but maybe you'll have better luck.