49As regards the grounds for optional non-execution provided for in Article 4 of Framework Decision 2002/584, it should be noted that Member States which have opted to transpose one or more of those grounds cannot provide that judicial authorities are required to refuse to execute any European arrest warrant formally falling within the scope of those grounds, without those authorities having the opportunity to take into account the circumstances specific to each case (see, to that effect, judgment of 29 April 2021, X (European arrest warrant – Ne bis in idem), C‑665/20 PPU, EU:C:2021:339, paragraph 44).
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