The EU's area of freedom, security and justice is no longer new, but the measures which are now being adopted in the fields of judicial cooperation in criminal matters, police cooperation and counter terrorism are truly radical and will have a deep impact on the citizens of the Union. Some developments, like the European Arrest Warrant have already elicited substantial suspicion from some supreme courts in the Member States. Other measures, such as those in counter terrorism, defy EU constitutional gravity remaining suspended between the Second and Third Pillars.This book is designed to examine three key fields: police cooperation, judicial cooperation in criminal matters and counterterrorism. It is targeted at the graduate level student who is studying law, political science, international relations, criminology, geography, history or sociology with an EU dimension. It provides a key resource for reading lists on courses on the EU in all these fields as it comfortably straddles the different disciplines while providing an important analysis of the EU's criminal law and policing.