I'm very impressed by the phrase "non-negative test" you have used, Hatch.

Drug and Alcohol testing time was for me perhaps the worst time I ever had as a manager of people. Being in the rail industry, we had a total zero tolerance policy, even though my workers had nothing to do with train and transport operations. So I'd have to deal with people who had a sudden attack of civil liberties principles and refuse the test 'as a matter of principle', or people who had a smoke a month ago and were worried they would be positive. No fun at all.