reminds me of a job interview I had at the Budweiser brewery in Richmond in 2002. The HR lady told me if I was successful and proceeded to the second round of interviews I would have to have a drug test and if there was any reason that i didnt want to have the test then not to accept the offer of the second interview.
she was very shocked when i told her I would test positive to Heroin, amphetamines, benzo diazapams amongst others. I then proceeded to inform her that I worked in a drug manufacturing facility and that was the reason they didnt introduce random drug testing, too many people would test false positive.