The rules are there (yet always changing), but it takes human performance to make them 100%.
Last week my friend got a 'call' that someone was attempting to extract some $15K from her account. She went to her bank, me with her, another story, unrelated.
The bank agent who assisted her found a lot in regard to this problem, including a copy of the check that had already been processed and the $15K deducted from her account. BUT, the check had been "washed", different check number not in sequence with her own. The To line had a name, male, she of course didn't know, never heard of this name. What 'survived' was her signature, of course. The bank agent told us how stolen checks can be "washed" blank of everything except the signature, re-made out to the thief, etc. The fake check number, bank logos, account and routing numbers, everything except her signature fraudently replacing the washed check. I'd seen this on TV a year or more ago.
Her bank now...after she went in and reported the call she'd received...has initated an investigation, she has signed for prosecution in the event the perp is located, etc. Closed that account, opened new one, etc. Bank lady said "sometimes" those investigations are successful. Better perhaps that she had called her bank right away, since there was at least maybe two hours between her receiving the call and reporting it in person. (But why would anyone call her to alert her to the problem?)
Clearly nobody that cashed that check did any checking re the legitimacy of it. The bank lady didn't say where the check was cashed, if she knew, but I bet she could tell. Banks don't tell you everything they know, of course.
Even more weird is a story from my SIL. She noticed in her bank balance something like $10K added to her balance. She didn't ask her husband, my brother, about it, knew it was odd but didn't want to upset him, thought somehow things would straighten out on their own. !!! It happed again, different amounts. Money INTO her account!! She is one of the world's most honest people, but it took days/weeks before she went to the bank and reported this. Has no idea of the outcome, no changing of her account.
Same bank, she went inside to withdraw something like $120. Was handed the cash in one of the bank envelopes, walked out to her car, on to the rest of the day, until she opened the envelop and found over $800 in cash. (Maybe she had asked for her $120 in five dollar bills?) She hurries back to the bank, they are beyond grateful that she returned, said they were in a major dither trying to figure out the problem; the teller would be dunned for the $800. Again, she has no idea of the outcome. Did she change banks? I didn't think to ask her. Obviously (to me) some sort of major performance errors by bank personnel in these situation. I mean, what scammer deposits money into an account they wouldn't be able to profit from? On the other end, somebody would be missing deposits into their account they would be expecting.
One thing regarding my friend and the washed check: I've noticed when I go to her house, a good neighborhood, she has an outside mail box attached to the bricks at her front door. It has some sort of clip whereby she clips her outgoing mail, which flapping in the wind, is obvious to a mail carrier who would pick it up, but also obvious to anyone looking to steal mail with the idea of stealing checks or money. The bank agent said this is not a good idea (ya think?), and neither is putting outgoing mail into the blue boxes. She said best to go inside to mail anything like that. My friend admitted she has had some checks she mailed that never arrived at the destination. Hmmm.
Sorry for long stories. Maybe helpful to somebody.
Candy