This is already easily done. Just exclude the security features that prevent opening or printing. If they're in that much of a hurry then they're not looking an

This is already easily done. Just exclude the security features that prevent opening or printing. If they're in that much of a hurry then they're not looking anyways. The only time the visual detection would be used is in conjunction with the other physical methods that cannot be printed. Overwhelmingly transactions are digital, and for bigger stores self checkouts are used. If the problem was significant then cash registers can easily handle the bills and automatically scan them as self checkouts do. I would presume the level of fraud isn't even high enough to the cost of that hardware.