The European Arrest Warrant (EAW) is the seminal instrument in the field of EU judicial cooperation in criminal matters. It is widely used, and has proved to be an efficient tool in accelerating the execution of warrants and surrender procedures in cross-border criminal cases within the EU. At the same time, the EAW still poses a number of issues – mostly related to the protection of constitutional and fundamental rights – that Member States find difficult to accommodate in their respective legal systems. It is in this context that the seminar will map out the operational success of the EAW and discuss the concerns present in the application of the EAW.