Is there a reliable source on the internet for information about potential causes of false positve drug tests?

Question

Specifically tests showing you use Paxil

More specifically, the test showed positive FOR Paxil, I.E. said that the person in question was taking Paxil, when he is clearly not

Answer 1

Here are two extensive lists and, as you can see, paxil (Paroxetine HCl) is not one of the drugs that cause a false positive.
http://www.passyourdrugtest.com/false-positives.htm
http://www.ureasample.com/false_positives.shtml