Welcome to the “Counterfeit Money: Security Features on Bills” video lesson designed to help people who handle United States cash be able to recognize inauthentic currency by teaching the U.S. Department of Treasury’s guidance on recognizing different security features. This lesson is the first of four in the “Counterfeit Money” course, which is intended to help teach people how to detect fake currency, and how to respond if they do. After watching this video, learners will be aware of the security features of U.S. bills, including watermarks, color shifting ink, and security threads.