Excuseable reasons for failing drug test?

Sorry guys, but I have to disagree with you on this one. If an OTC cold remedy contains ephedrine, it can show up as a "positive" for amphetamines on a tox screen or drug test. It all depends on the sensitivity of the lab test that is being used.ETA: False positives can also be caused by cough syrup containing dextromethorphan, OTC diet pills and supplements, and eating poppy-seed rolls (which cause a "positive" result for opiates.)