Medical testing by employers is done primarily for liability reasons. To require medical testing for rebreather divers opens up a whole can of worms on a slippery slope. Who would enforce it, who would penalize for violation of it, and would it pass Constitutional muster although that never seemed to stop the government from infringing on Citizens rights.

How about medical testing to drive a car?

I think most CCR divers would be opposed to testing.

Ace, he was being trained to do preventative pelvic exams on female athletes.