34As regards, first, the principle of effectiveness, the Court has already held that every case in which the question arises as to whether a national procedural provision makes the application of European Union law impossible or excessively difficult must be analysed by reference to the role of that provision in the procedure, its progress and its special features, viewed as a whole, before the various national bodies. In that context, it is necessary to take into consideration, where relevant, the principles which lie at the basis of the national legal system, such as the protection of the rights of the defence, the principle of legal certainty and the proper conduct of the proceedings (see, to that effect, Case C-40/08 Asturcom Telecomunicaciones [2009] ECR I-9579, paragraph 39 and the case-law cited, and Aziz, paragraph 53).
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