The principle of ne bis in idem in the context of European arrest warrant: A view of the jurisprudence of the European Court of Justice

In this paper, we analyze the most significant ruligs of the Court of Justice of the Europian Union regarding the interpretation of the provisions of the Framework decision on the European arrest warrant which established the principle of ne bis in idem as one of the grounds for both mandatory and optional non-execution of the extradition request issued to the judicial authority of the executing Member State. Although the European arrest warrant is one of the most important mechanisms of cooperation in criminal matters between Member States, the provisions of the Framework decision that established the European arrest warrant as part of the EU law do not define precisely enough some of the key aspects of its implementation, leaving plenty of space for different interpretations and actions of national authorities, which in turn contributes to legal uncertainty and unequal application of the EU law within Member States. In this context, the European Court of Justice made some of the key points in the 2010 Mantello case and 2018 AY case, and primarily focused on issues related to the ''same act'' category as one of the key criteria for applying the ne bis in idem principle in transnational context. The inductive-deductive method and content analysis were used in the analysis of the cases mentioned above.