When he says it's useless, does he mean useless against the war on drugs, or worthless for the companies? Because I totally agree it's useless at reducing drug use on a large scale. But as an employer, it's a practice I would look into.
Obviously I'm not as well read as you on the topic, but working as a quasi HR person, I do have some opinions I've formed from my experience. My opinion is that pre-screening is useless. The people know it's coming, and any idiot who at least has enough brainpower to drive a car can figure out a way to beat the test. In all my years, I've seen one person not pass. Now, random testing is where I have seen a lot of people getting caught. And again, while I could care less about marijuana, it wouldn't be in my best interest to have a "real" drug user on the payroll.
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