I'd never thought of ATMs scanning the serial numbers of cash, but that makes sense. However, and maybe this isn't leading practice, but stores just seem to put

I'd never thought of ATMs scanning the serial numbers of cash, but that makes sense. However, and maybe this isn't leading practice, but stores just seem to put cash in a collective cash drawer, so they can't exactly tell what cash was used for what (though cash purchase would be rare these days). Are there regulations around logging serial numbers now?