Yes I think all workplaces should do drug testing, especially in places like factories and child care places such as schools and clubs.
The reason I think these to work places are important is because machines and drugs don't mix obviously, drugs can effect you in alot of ways and you could probably end up losing a hand.
And child care places should be tested because, I don't know about the rest of you but I don't want a drug addict taking care of my kids, it's why I don't let my sister have the kids alone, because she is a drug user (smokes).
Matt works in a printing factory and I know his do drug testing, not sure ow often tho, but I do know that one guy was fired for showing up as a user after one of the tests.