Police cooperation in the EU has been characterised by intergovernmental patterns of decision-making. With the Treaty of Lisbon (2009) it has been fully integrated in the EU as part of the Area of Freedom, Security and Justice (AFSJ). What has changed since then, which problems persist? What is the practical impact of the new rules established by the Treaty of Lisbon? How does the European Parliament use its extended co-decision powers in this field? What is the new role of human rights and data protection? Contributions by scholars from different disciplines and by practitioners analyse continuity and change of police cooperation in the EU in a political, legal and practical perspective.