24Accordingly, under the principles set out in the Directive, in particular in Article 3(1), and notwithstanding the rules of the EC Treaty relating to the free movement of goods, no plant protection product can be placed on the market and used in a Member State unless a prior marketing authorisation has been issued by the competent authority of that State in accordance with the Directive. That requirement has the same force even when the product concerned already has a marketing authorisation issued by the competent authority of another Member State, given that the Directive requires that prior authorisation be obtained from the competent authority of each Member State in which that product is placed on the market and used (see, to that effect, Case 0400/96 Harpegnies [1998] ECR I-5121, paragraph 26).
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