This extremely up to date book has enjoyed extraordinary and immediate success. The topic has always been of interest to the police forces that must now operate within a European population that increasingly enters Italy in the spirit of the Schengen Accords. The book contains the most recent legislation in terms of European cooperation and clearly explains the progress made by the European Union in matters of cooperation of Police Forces of the member States (EUROPOL operational as from July 1999). Following the new law on immigration, the Maastricht Treaty and Amsterdam Treaty in force as from May 1999, in 2001 the Nice Treaty was signed to prepare community institutions for the forthcoming enlargement of the Union, which envisages the participation of 28 states in the 2004 European elections. All the matters covered in this book contain the most updated information of interest to the police forces. The book also contains all the texts of the legislation covered therein, both national and international.