This guy use to be very cautious about using drugs a week or so before his monthly visit with his probation officer, however, since he has found a way to beat the drug test, he smokes pot everyday. I see this guy quite often because I do some work for his mother.
He didn't use to smoke pot, but he did use crack until just before the visit to his PO. Now I see he is doing everything because he now knows how to beat the test. He is thrilled he knows how to do this. Some of his druggie friends must have told him how to do it.
He didn't manipulate the test. It was faxed directly to his mother.