Cops Across Borders is the first book to examine the policies and issues that lie at the intersection of U.S. foreign policy and U.S. criminal justice. Drawing on interviews with nearly 300 U.S. and foreign law enforcement officials in nineteen countries as well as extensive historical and contemporary materials, Ethan Nadelmann examines how and why U.S. law enforcement officials have extended their efforts beyond American borders, how they have dealt with the challenges confronting them, and why their efforts have proved more or less successful. Nadelmann's analysis traces the evolution of U.S. law enforcement activities abroad since the nation's founding. During the nineteenth century, U.S. customs agents collected information on smuggling operations, naval officers tracked illegal slave trading vessels, slave owners tried to recover fugitive slaves who had fled to Canada and Mexico, Pinkerton detectives pursued fugitives and investigations around the world, and federal, state, and local authorities chased cattle rustlers, Indians, bandits, and revolutionaries across the border with Mexico. Today, U.S. federal law enforcement agents target an even greater array of crimes and criminals. The U.S. Drug Enforcement Administration (DEA), with agents stationed in about 70 foreign cities, is the principal nemesis of transnational drug traffickers. FBI agents abroad investigate terrorist attacks on U.S. citizens and interests as well as white-collar and organized crime. Customs agents focus on money laundering, high-tech smuggling, and a wide variety of frauds against the customs laws. Secret Service agents target counterfeiting. And attorneys in the Departments of State and Justice supervise the rendition of fugitives and the collection of evidence in criminal investigations. Cops Across Borders examines how U.S. law enforcement officials have responded to the challenges of internationalization: how DEA agents have adapted to the constraints of operating in civil-law countries that prohibit many U.S.-style investigative techniques, how DEA agents have worked with and around the widespread police corruption in Latin America, and how Justice Department officials have improved their capacity to secure evidence and fugitives from foreign countries that operate according to very different legal and social norms. Like other studies of comparative law, policing, and criminal justice, this book compares the approaches and behavior of law enforcement officials in different countries; but it also goes a step beyond those studies in its analysis of how criminal justice systems interact with and are influenced by those of other states. Nadelmann argues that the internationalization of U.S. criminal law enforcement has contributed to the "Americanization" of criminal justice systems around the world. Cops Across Borders demonstrates conclusively that the interpenetration of U.S. foreign policy and criminal justice institutions and concerns has become too substantial to be ignored by scholars any longer. It thereby breaks new ground in the study of both international relations and criminal justice. The even broader contribution of Cops Across Borders lies in its analysis of how systems devised for dealing with domestic crime respond to the demands of internationalization.