How much Heroin does it take to show up in a UDT?
Basically if there is any heroin in your system it will show up on a UDT. The test is so sensitive that eating foods containing poppy seeds can cause a false positive. This is because the UDT isn’t measuring the levels of heroin in your body, but the levels of a heroin metabolite. This metabolite is also a byproduct of poppy seed digestion, hence the false positive.
