Is that even legal? I've always been told that here the most they can do is say whether or not you are eligible for rehire
Yes, that's how it's
supposed to work.
Supposed to...
There are always loopholes.
Besides, unless the HR interviewer comes out and admits the specific information they got from a previous employer, it's one of those things that is hard to prove.
I think a lot of the degree of a background check has to do with the particular company and/or position applied for.
It sounds like Bay might work in an environment that goes over every detail with a fine-tooth comb.
Other places may just do a simple background check consisting of criminal & credit history.
If you left a company on less than good terms
(terminated), then - if possible - give the name of a supervisor
(or even a coworker) with whom you got along.
Companies know you won't volunteer shitty references, and if you provide a good one from the place that fired you, there's a chance that - if they even call at all - they'll call the person who liked you and will say good things about you.
A lot depends on how much research they're willing to do.