25As a preliminary point, in response to the argument put forward by the Republic of Poland that, since the contested prohibition did not come into force until 1 January 2013 it was, in effect, possible to produce, to place on the market, and to use in animal feed, genetically modified feed in accordance with Regulation No 1829/2003, the Commission, relying in particular on Case C-185/96 Commission v Greece [1998] ECR I-6601 and Case C-259/01 Commission v France [2002] ECR I-11093, claims that the adoption of the contested prohibition and the postponement of its entry into force was contrary to the principle of the legal certainty.
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