Do you talk about crystal meth or medications for ADHD (attention deficit disorder)?
metamfetamine can also be found in speed and ecstasy
Im not a drug and toxicology specialist but maybe a positive test could come from either illegal or pharmaceutical drugs such a Ritalin and the like.
according to : https://www.drugbank.ca/drugs/DB01577''
hmm, that also depends on where and what kind of tests you did cause I know people who have also failed drug tests but they were completely clear, the problem was with the test itself. I mean, when you're doing the test at a center then you will probably have something as they may do something wrong.. That is why I don't trust them, and when I have to do a drug test I do it at home with tests from https://www.confirmbiosciences.com/products/urine-drug-test-dip-cards/urine-drug-test-dip-cards/. My doctor recommended them to me, so it is certified.