The Diplomatic Security Service (DSS) is an American federal law enforcement agency under the Department of State, responsible for the protection of foreign dignitaries on U.S. soil, criminal investigations, counterintelligence, fugitive apprehensions overseas in support of the U.S. Marshals Service, and security for U.S. officials overseas at U.S. embassies. Before joining CTU Los Angeles, Peter Jiminez worked for several years as a special agent with the Diplomatic Security Service. (Chaos Theory)