I don't do drugs; I barely even drink alcohol. But, I think drug testing is a violation of privacy and none of a company's business. This isn't 1950, nobody cares if you're doing drugs on your personal time as long as you're sober for work.
Yes, you need to drug test for clearance. But I'm saying that's a job I'm not applying to unless I have no other choice. It goes straight to the bottom of the pile for me.