There's no way it's going to give a false possitive for THC, it just doesn't chemically make sense. What it may give a possitive for is opiates, because codein is a (milder) opiate. Don't try to pop 20 of them to get high though, T3's are full of acetaminophen which can be deadly at levels as low as 5 times the recommended dose.
mrdevious Reviewed by mrdevious on . Will Tylenol 3/Codeine throw a THC positive? Just something I heard, no idea whether it's true or not. But I heard that if you are taking Codeine/Tylenol 3 for pain relief, it can come up at a false positive on a standard 5 drug test. Can anyone confirm? Rating: 5