State frontiers have stopped representing, for a long time now, an obstacle for offenders, but, unfortunately, they continue to represent a barrier for law enforcement authorities. Through the Lisbon Treaty, the member states of the European Union have regulated the judicial cooperation in the criminal field aimed at ensuring concordance between this field and the evolution of society from a realistic and pragmatic perspective. By providing an area of freedom, security and justice, the European Union requires, firstly, the improvement of judicial cooperation between the member states in the criminal field, by respecting fundamental rights, as well as the different legal systems and traditions of the member states. After adhering, any member state, becomes involved in the process of harmonization of national criminal law with the European one and at the same time, in appropriating the principle of priority of Community law, the principle of performing all obligations in good faith; the principle of interpreting national law in conformity with European law and the principle of harmonizing national criminal law with the European one. But state sovereignty remains one of the limits of cooperation against crime between the EU member states, one of the solutions being the assistance that states mutually award one another in combating criminality, as regulated by the documents of the European Union.
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