I've never had security clearance of any kind. Highlights that all required drug testing were: restaurant national headquarters, towing/insurance national headquarters, theme park, defense contractor for non-secure projects, and a bank.
Though now that I think about it I have technically worked at two companies that didn't drug test: my own, and a small 3-man startup I did some work for.
It's worth mentioning that I live in a red state. I suspect blue states have cultures that are a little more lax on drug testing, though I have no real data to back that up.