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EUR-Lex -  61991CC0143 - EN - Opinion of Mr Advocate General Lenz delivered on 11 June 1992. - Criminal proceedings against Leendert Van der Tas. - Reference for a preliminary ruling: Arrondissementsrechtbank Breda - Netherlands. - Agriculture - Substances having hormonal effect - Directives 81/602/EEC, 88/146/EEC and 86/469/EEC. - Case C-143/91.