>Fifth, and this one may seem like a silly reason to most, the drug testing (for marijuana specifically) is a huge barrier of entry. From a safety perspective, it makes sense. But for better or worse, marijuana use is becoming more socially accepted while work places (and in particular trade jobs) are lagging behind the times. Removing a marijuana screen from standard workplace testing would help revitalize the employee pool.

Perhaps (and I'm granting some leeway here) we don't yet have the tools or the data to understand well enough how something like THC affects motor skills like we do with alcohol, but someday I expect we will. Work places (particularly those with high safety concerns) shouldn't make any sacrifices just because something is socially acceptable. You can't show up drunk, and alcohol is more socially accepted than marijuana.