50However, since a ban such as that which arises from the national legislation at issue in the main proceedings amounts to a derogation from the principle of the free movement of goods, it is for the national authorities to demonstrate that those rules are consistent with the principle of proportionality, that is to say, that they are necessary in order to achieve the declared objective, and that that objective could not be achieved by less extensive prohibitions or restrictions, or by prohibitions or restrictions having less effect on intra-Community trade (see, to that effect, Case C-17/93 Van der Veldt [1994] ECR I-3537, paragraph 15; Franzén, paragraphs 75 and 76; and Ahokainen and Leppik, paragraph 31).
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