34As for the principle of proportionality, that is one of the general principles of EU law which must be observed by any national legislation which falls within the scope of EU law or which implements that law (see, to that effect, Case 77/81 Zuckerfabrik Franken [1982] ECR 681, paragraph 22; Case 382/87 Buet and EBS [1989] ECR 1235, paragraph 11; Case C-2/93 Exportslachterijen van Oordegem [1994] ECR I-2283, paragraph 20; and Joined Cases C-422/09, C-425/09 and C-426/09 Vandorou and Others [2010] ECR I-12411, paragraph 65).
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