Ne bis in idem is one of the key principles of EU criminal law. On the one hand, it is an important individual safeguard for suspects and convicted persons in the EU, as it protects against double prosecution and double punishment. On the other hand, it is the only mechanism – although imperfect and insufficient – to regulate conflicts of jurisdiction in the Area of Freedom, Security and Justice (AFSJ). A final judgment in one Member State indeed prevents another Member State from (further) prosecuting the same person (again) for the same facts.
Last June the Court of Justice (CJEU) issued an important judgment regarding the scope of the transnational protection against double jeopardy. The decision of the CJEU further expands the concept of ‘final decision’ triggering the ne bis in idem, confirming the validity of the previously consolidated trend which, on the one hand, recognises a strong importance to the mutual trust between Member States, and on the other hand acknowledges the inherent link between ne bis in idemand the freedom of movement in the EU.