[rxsid]

"I wonder if folks who’ve already been fired have any recourse in light of this...?"

It's an interesting question, although not in light of this particular ruling (OSHA, fed gov).

Question - Under what lawful authority, can an employer mandate their current employee's to ingest/inject a medicine they don't want or need?

Presumably, this would be a state issue. However, again, what state law could such a mandate fall under, and is there no limit to what medicine a company could require employee's take?
Furthermore, what if the company in question does business / have locations in more than 1 state?

[Cboldt]

I’m holding out for the mandatory shots of tequila ....

[Enlightened1]

No they cannot legally do that. It violates the Americans For Disability Acts and the Nuremberg Code.

[Bruce Campbells Chin]

Most states are employment at will, and an employee can be fired for any reason or no reason, except one expressly prohibited by other law. So, employers generally don't need to have a specific law authorizing them to fire employees for not taking the vaccine.

To challenge such firing successfully, it will be up to the employee to find a specific law prohibiting them from being fired for refusing to take the vaccine. There isn't any federal law that says that clearly and unambiguously, so they're going to have to find other statutes and argue that they apply in their case.

Some employees may win, but it isn't going to be a slam dunk.