You'd be shocked how stupid people are with green. Usually it's the 'dumb immigrants' that are more suspicious. In Miami, there was a story of someone who bought a car with over 1/2 counterfiet bills, and the car dealer didn't realize it until after the guy bought gas in said car(the gas cashier tested the bills), to which the police backtracked his phoney spending habits. I can't find the story on google news, but it happened a few years ago.