One of the darker sides of the increasingly unregulated movement of persons and goods across national borders is the internationalization of crime and the networks that sponsor it. Efforts to expand criminal investigations across national borders create an urgent need to coordinate U.S. efforts with those of other governments. To meet this need, cooperating countries will have to assess the legitimacy of law enforcement methods that, while routine in the United States, are greeted with skepticism elsewhere. Among the most controversial of these methods is the use of covert tactics, especially undercover investigations, to infiltrate criminal networks. Different countries vary significantly in their attitudes toward the legitimacy of undercover investigations and in their approaches to regulating them. Responding to the increasing need of European and American policymakers to coordinate their efforts against crime, two highly synthetic and wide-ranging anthologies have collected the contributions of legal scholars, sociologists, criminologists, police officials, and policymakers in an effort to illuminate the differing national contours of the debate about undercover policing. The first of these books, Undercover: Police Surveillance in Comparative Perspective, came out in 1995. The editors are the Dutch criminologist Cyrille Fijnaut, who has written extensively about the European experience with undercover policing, and the American sociologist Gary Marx, who has authored seminal work on American undercover policing, including the invaluable Undercover: Police Surveillance in America! The second work, Undercover Policing and Accountability from an In-
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