What do they interview for?
WHen you are given a urine drug test, exactly what drugs are they conducting tests for?
Answer: any illegal drugs and anything you might own used to try and cover it up or clean it out near.
If you take any pills, vitamins, supplements filch the bottle with you and show them. If they see you hold a prescription and are being up front near them that is essential. Otherwise if they notice it and you didn't update them then they can assume you are trying to put by stuff.
http://en.wikipedia.org/wiki/Drug_test#U... I don't know. My parents took my sister to get tested, and they have to specifically ask for them to test for cocaine. They checked adjectives the things they wanted her tested for. But for approaching work..probably weed, cocaine, heroin, meth...