“False positives” are instances where the metabolite of a legal prescription drug or other substance (e.g. poppy seeds) tests positive for the metabolite of an illicit drug. Because marijuana’s metabolite is fairly unique, “false positives” are rare. However, at least one common prescription medication, Protonix (pantoprazole sodium), warns of “false positives” for cannabis. Over-the-counter ibuprofen products (e.g. Advil) will not test positive for marijuana on modern drug screens, but numerous OTC cold remedies may trigger “false positive” results for amphetamines, primarily on the EMIT test. Consequently, employees subject to random testing should insist that all positive test results be substantiated by follow up testing.