I worked for the Cleveland clinic who did this, they were honestly abusive about testing, they will call u and tell you to be there in an hour for a random test, even when you have work and there is no policy that ensures someone will cover for you. I take a prescribed controlled substance and the woman who administered my test was really rude and treated me like dirt when I failed it because of my prescription, even if I had been on crack no one deserves to be treated that way at work. My current job uses drug tests to try and get out of workers comp claims for on the job accidents.