Summary: How much do we actually know about liaison officers, their work, their dilemma's, and the politics surrounding their deployment? How do policies and budget developments affect liaison officers schemes? What can be said about their preparation and professionalization? This book presents rich and illustrative empirical material on the use of liaison offices in police cooperation. The authors, both eminent academics and seasoned practitioners (and in some cases from a dual academic-practitioner background), present their findings from a wide range of geographical and functional viewpoints. Students and law enforcement professionals are made familiar with the blue web of policing across the world. This book offers them a considerable variety of perspectives, ranging from academic to professional, from institutional to informal, and from sociological to psychological