I was given a PEth test and it can back positive even though I have not consumed alcohol in 6 years. My company told me that it is impossible to get a false positive on a PEth test. I know that that cannot be true because I haven't had anything to drink. Is there anything out there to support a possible false positive for my defense? The only information I can find seems to come directly or indirectly from the testing lab itself USDTL...