That's the bank fraud statute. It applies if someone attempts to defraud your bank. It does not apply if your customer attempts to defraud someone else. Post dating a check is not against the law (never has been) unless it is done as part of an attempt to defraud someone.
I would classify all of these as "voluntary" and, simply put, a waste of everyone's time.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.