Marijuana

The employer testing likely will hinge more on their ability to hire and retain workers than anything else. I've read that there's a severe lack of computer experts in some government positions as the better talented coders and hackers can not only make more money, but also smoke elsewhere.

When the workers revolt take skills elsewhere to the point that business profits are impacted is the only scenario I can see making much difference right now. There are the obvious already stated exceptions tho.