24As to whether the national courts may, where there has been an abuse by the worker concerned, query the certification of incapacity for work issued in accordance with Article 18 of Regulation No 574/72, the Court has consistently held that Community law cannot be relied on for the purposes of abuse or fraud (see, in particular, regarding freedom to provide services, Case 33/74 Van Binsbergen v Bedrijfsvereniging Metaalnijverheid [1974] ECR 1299, paragraph 13, and Case C-23/93 TV 10 v Commissariaat voor de Media [1994] ECR I-4795, paragraph 21; regarding the free movement of goods, Case 229/83 Leclerc and Others v ‘Au Blé Vert’ and Others [1985] ECR 1, paragraph 27; regarding freedom of movement for workers, Case 39/86 Lair v Universität Hannover [1988] ECR 3161, paragraph 43; regarding the Common Agricultural Policy, Case C-8/92 General Milk Products v Hauptzollamt Hamburg-Jonas [1993] ECR I-779, paragraph 21).
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