How to Detect Fake US Money?

The U.S. government estimates that less than 1/100 of 1 percent of U.S. paper currency in circulation is counterfeit. Considering recent advances in printing technology and the obviously vast incentive to counterfeit bills, that's a pretty small number. In part, that's because the U.S. Secret Service thoroughly investigates all reported counterfeiting cases, and because there are harsh criminal penalties for counterfeiting or passing fake bills. Perhaps more than anything, though, counterfeiting is difficult because of the bills' security features, which are hard to reproduce but easy to use to verify your money's authenticity.

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