40It should be noted at the outset that the principle of mutual trust between the Member States is of fundamental importance in EU law, given that it allows an area without internal borders to be created and maintained. That principle requires, particularly with regard to the area of freedom, security and justice, each of those States, save in exceptional circumstances, to consider all the other Member States to be complying with EU law and particularly with the fundamental rights recognised by EU law (Opinion 2/13 (Accession of the European Union to the ECHR) of 18 December 2014, EU:C:2014:2454, paragraph 191 and the case-law cited).
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