A quick Google found me this: http://www.secretservice.gov/money_detect.shtml http://www.secretservice.gov/money_detect.shtml While the legitimacy of the page

A quick Google found me this: http://www.secretservice.gov/money_detect.shtml http://www.secretservice.gov/money_detect.shtml While the legitimacy of the page is kinda um... I'm not convinced, it does suggest that the hard part of counterfeiting is in printing quality.