I have never had a problem with that. If it’s a prescription and it shows on a test, it’s not any business of the prospective employer. When I am at the testing facility, I always disclose to them that I am taking amphetamines. I dunno if they have a box they need to check off for that, but I really don’t care. Since my medications are legal, any disclosure of that testing data would fall directly into the category of HIPAA and not something your average company can handle.

At least in the US, scheduled medication is tracked fairly hard. I suspect my name would come up if the testing facility checks for that kind of thing. (Just speculation: I have no idea how the system works on the backend.)

More speculation: There may be specific markers in legal, scheduled medications. Is that a thing? If so, it might be a clue into legal or illegal use for the test.