Excuseable reasons for failing drug test?

No way would a non prescription OTC cold medicine yeild a positve drug screen. This is a VERY common excuse and while I understand why this person would want to deny and justify, it simply is not possible. Especially given their past history. I have heard just about every excuse under the sun for people having tests come up dirty, The only way a cold medication would yeild a positive test is if it were a prescribed medication for instance codiene based but NEVER an OTC. Do you know what the test showed positive for? Opiates,ect? As I always tell my patients, "Tests don't lie, people do" It would be better if the person just came clean with the truth and then get the services they need so that it does not happen again. Mommy2fiveplus, I too work in an out paitient substance abuse clinic(methadone) and we use both oral swabs ad uas (piss quizes). I find the tests to be accurate. EZ