Sorry, but productivity is best measured by evidence previous work-- not one's piss, blood, hair, or facebook friends.
The other reason that drug testing is senseless and stupid is that it is imprecise. "False positives" do wreck careers and/or cause enormous hardship on good people, you might call it collateral damage, but to the people it occurs to it is a disaster.
In my own case, I had been scheduled to submit to a hair test as pre-employment screen. I showed up at the testing facility and was told my hair was too short and that a urine sample was required instead. These are different tests and the urine sample does check for alcohol consumption whereas the hair test does not. The previous night I shared a bottle of wine with dinner with my wife and I had also taken advil because of the headache induced by the stress of giving my termination notice at work. Everything turned out OK, but the stress caused by worrying about a stupid false positive because of the wine, advil, or my prescription was really not a nice experience. If there had been a false positive, I would have been begging for mercy, disclosing my drug prescription, explaining away the advil and wine. I guess some people would see value/pleasure in that. I fucking don't.
The other reason that drug testing is senseless and stupid is that it is imprecise. "False positives" do wreck careers and/or cause enormous hardship on good people, you might call it collateral damage, but to the people it occurs to it is a disaster.
In my own case, I had been scheduled to submit to a hair test as pre-employment screen. I showed up at the testing facility and was told my hair was too short and that a urine sample was required instead. These are different tests and the urine sample does check for alcohol consumption whereas the hair test does not. The previous night I shared a bottle of wine with dinner with my wife and I had also taken advil because of the headache induced by the stress of giving my termination notice at work. Everything turned out OK, but the stress caused by worrying about a stupid false positive because of the wine, advil, or my prescription was really not a nice experience. If there had been a false positive, I would have been begging for mercy, disclosing my drug prescription, explaining away the advil and wine. I guess some people would see value/pleasure in that. I fucking don't.