Back in my middle school days I’d crank the DPI of my scanner to the max and take super detailed images of bills. It tried its best at printing them too, but you couldn’t fool a person with them. Some kids did fool coin exhange machines with homebrewn bills though. These days I don’t think you can even scan the bills and the scanner calls interpol / secret service etc. for even trying.
I thought gambling addicts were broke?