If you are arrested and tested for drugs, you expect that test to come back accurately. If you don't use drugs, it would be an absolute shock to be accused of being drugged.
That's similar to what happened to this young man. The 34-year-old man was at school in New York's Willard Correctional Facility at the drug treatment campus when he was asked to take a drug test. He was formerly a heroin user, but he had stayed clean throughout the program. In fact, he had only a month to go before he would get to leave and go home.