44As regards, lastly, the definition of the concept of ‘serious offence’, it is apparent from the case-law that, in so far as the European Union has not legislated in that field, criminal legislation and the rules of criminal procedure fall within the competence of the Member States. They must, however, exercise that competence in line with EU law (see, to that effect, judgment of 26 February 2019, Rimšēvičs and ECB v Latvia, C‑202/18 and C‑238/18, EU:C:2019:139, paragraph 57 and the case-law cited).
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