Congress has written the laws about using a someone else’s social security number is such a way that employers can get in trouble if they try to do something when a SS # check comes back as invalid. Congress does this cloudy Law-making on purpose to protect their big donors. Congress could fix this one in short order if they wanted to. They do not.
What law is that?
I used to verify a new hire SSN just on the SSA website. A few times I got back other names used with it, but they were explainable.