I honestly don't think people realize just how often these tests result in false positives until it happens to them. The only drug test I've ever taken came back positive for meth. XD In addition, people are mislead by % points. Even if only 2% of drug tests come back as false positives, when you multiply that across millions of people and when you have those same people take multiple tests a year... well that's a lot of people getting slapped around by faulty testing.