What does that mean? That means that in 2% of the cases when it should have read negative, that the person didn't do the drugs, it actually read positive. It is a false positive. It should have read negative, but it read positive. Another way to think about it, if someone did not do drugs and you take this test, there's a 2% chance saying that you did do the illegal drugs. They also say that there is a false negative rate of 1%. What does that mean?