Excuseable reasons for failing drug test?

I'm including the link of a website that shows a table of the over-the-counter drugs, as well as prescription medications, that can cause a "false positive" in drug tests. This is a HUGE problem right now, one that has been written up in all the major newspapers, including a June 28, 2008, article in the Los Angeles Times.Also, EZ, I have to disagree with you on the drug screens. It is the cheaper lab tests that show the false positives. The problem right now in the field is that hospitals and/or employers are NOT required to conduct a gas chromatography-mass spectrometry (GCMS) on the same sample. The GCMS is expensive, but it should always be used to confirm a positive drug test that is being disputed, IMO.[url=http://www.doctorspiller.com/local__anesthesia_7.htm]Local Anesthesia--Drug Testing[/url]ETA: The website link is safe ~ it belongs to a dentist named Dr. Spiller.