What common things can cause a false positive in the amphetamine region of a drug test?

I tested positive, and have never ever ever done drugs.What common things can cause a false positive in the amphetamine region of a drug test?
Over the counter antihistamines like sudafed will sometimes test positve on the screening test.What common things can cause a false positive in the amphetamine region of a drug test?
Certain prescription drugs can lead to a false positive. I had a family member who tested positive for Meth the other day, but it turns out that a prescription drug was the culprit.





Have you been taking any kind of pill at all?