Are drug tests (for a job) an invasion of privacy?

[I spent the winter writing songs about getting better]

Yes. I'm glad my job doesn't do it. Of course you had to sign some thing agreeing to drug tests if they asked when you're hired, but they never actually do them.

[I spent the winter writing songs about getting better]

I've never understood the point of them. Why do you care if your employee smokes pot when he gets off work? As long as he isn't coming to work high, it's not an issue. Just like alcohol. If you frequently come to work drunk, you'll be fired, but no job cares if you get absolutely plastered every night as long as it doesn't affect your work. I happen to know for a fact that some rather high up people at my job are big on pot too (and I don't mean that they have a joint at a party every couple months or so, I mean BIG.) yet they never come to work high, so so what?