I think they simply don't do it quite that way. If halfway competent. Instead, when someone wants to get rid of an employee for a reason that might not be legi

I think they simply don't do it quite that way. If halfway competent. Instead, when someone wants to get rid of an employee for a reason that might not be legitimate, they write them up for about a dozen vague and contradictory things, and then present it as a "sign or be fired on the spot" thing, whereupon the employee signs, either because they convince themselves they can salvage the situation, or they just need more time to job hunt. Then after a little while, they do it again, so it fits into the normal framework of someone being put on a PIP and failing to improve. When they quit or are fired, it's essentially impossible to challenge, because it wasn't just one or two tiny things, it was a whole list of BS, and the employee signed their name to it to buy time. Or at least it's intimidating enough I think few people would consider suing.