Counterfeit currency has been a focus of international concern since Interpol's beginnings, because it has always been an international crime. Interpol resolutions and conferences have focused on this crime and ways to deal with it. The Interpol central office now performs several crucial functions in this area. Its basic role is to centralize, analyze, and disseminate information that may help trace, prevent, and suppress counterfeit currency. It operates an international data bank and serves as a reference center and center for technical documentation. It analyzes investigation information, provides information to law enforcement officials and coordinates investigations. It also distributes information about technological developments in counterfeiting and does physical tests to identity counterfeits. Photographs and footnotes.