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Erowid.org has a list of all the substances that can throw a false positive for meth. It is a VERY long list--probably 80 different drugs including diet aids, cold pills and a lot of prescription medicines.

Meth is a phenethylamine-class drug AND an amphetamine-class drug, so any drug that looks like an amphetamine, or any drug that looks like a phenethylamine (and there are a BUNCH of these, most not being any fun at all) will trigger a false positive for meth.

It gets better: the first order metabolite of meth is amphetamine, so anything that will throw a false positive on an amphetamine test will also throw a false positive on a meth test.

That having been said, most people don't test for meth at all--they look for amphetamine because methamphetamine (amphetamine with a methyl group attached) demethylizes in the liver quickly.

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