I didn't necessarily mean that they would be breaking procedure -- I think it's more likely that the procedures won't be very rigorous. I doubt that procedures for vaccination will be any more rigorous than the procedures for ensuring compliance with mask wearing.

As far as this being unethical -- maybe it is -- but since when has that stopped anyone? There are people still being forced to go to work sick because they have no way to take sick leave without losing their jobs.

Dunno. Larger companies I'm familiar with have pretty rigorous back to the office procedures which I could see extending to proof-of-vaccination at some point. Without it, they could just not enable badge access. But, as you say, uncharted territory.

I think, at best, we'll see a situation similar to the requirements that state schools have for enrollment. All 50 states "require" kids to be vaccinated.... but 48 states have religious exemptions.

At the end of the day, it's a lot less risk to HR to not piss off a couple of politically fringe employees over something that the vast majority of employees will do voluntarily anyway, without any coercing. Two unvaccinated employees out of hundreds probably won't cause a problematic COVID outbreak, but they could file a lawsuit.