I was a programmer for 25 years and never had a drug test in that time. No employer ever even contemplated doing it. In general, programming high or drunk isn't going to hurt anybody, but I did once have a colleague accidentally shoot a 125 mph knuckleball a foot over a kid's head. He wasn't coding high as far as I know, but he was coding stupid, which is a lot worse.

Ok, storytime!

I worked in a little fabrication shop back in 2013 or so. The general manager got a hair up his ass and decided he was going to drug test everyone.

We lost everyone on all three shifts except for me, and my supervisor. My supervisor had been picked up a month prior for possession, and was getting regular drug tests from someone else. Im just boring.

The shop closed down a few months later. They couldn't get anyone to work there, because people who do that kind of work talk to each other.

I'm a school bus driver and drug testing is a DOT mandatory requirement. Some of the districts around me have a reputation for making sure the "random" tests are only give to the drivers they know will pass, so a driver just has to keep clean long enough to pass the initial screening.

In my case it was fabrication shops and machine shops. But exactly like you say.

Don't forget Healthcare and insurance. I only know insurance because I have an uncle that has said he'd start micro dosing just to help him sleep but that could result in loss of his license

I used to run lasers capable of cutting 19mm steel plate. Have to be sober for that!

I'm skeptical that's what we're actually testing for, though. Employment drug tests are just to see if they'll stop doing drugs for a month. We don't expect heavy machine operators to do a field sobriety test at the start of their shift.