The University of Leicester's Centre for the Study of Public Order undertook a comprehensive study of police cooperation in Europe. The investigation looked at the diversity of policing arrangements within the EU and political sovereignty issues. Data on police organizations and activities were collected from all 12 EU member states, and research papers and academic journal articles were received or obtained. Consideration was given to different levels of police cooperation. Investigation results document crime, border control, and immigration issues in the context of the EU and policing strategies. The focus is on crime levels, international terrorism, drug trafficking, offender mobility, the free movement of goods, the movement of capital and international fraud, environmental crime, noncriminal victimization, and extradition. Police forces in Belgium, Denmark, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Portugal, Spain, and the United Kingdom are detailed. Structures for police cooperation are identified, including Interpol, the Schengen Group, the Trevi Group, the Maastricht Treaty, and the Council of Europe. The authors also examine football hooliganism, traffic management and control, technical and forensic matters, border policing, bilateral cooperation, and police communications and information exchange. Proposals for enhancing police cooperation and effectiveness are offered. Additional information on the findings of the investigation is appended. 189 references, 4 tables, and 5 figures