A positive drug test may result in a probation violation under Tennessee law. I was in court recently in Williamson County and watched a probation violation hearing take place before my hearing. It involved a sweat patch drug test system by Alcopro. It's the first case I have seen with this drug test. The concept is that it catches the sweat then they send the patch off for testing. According to the Alcopro website, the patch undergoes a gas chromatography mass spectrometry test.