the environmental codes are one of the most important standards in the legal system. are written using the legislative technique more refined. must be drawn up taking into account the social reality of the territory which became effective national legislation, the legislation of other States, the doctrine, jurisprudence and the Tradition. Ray Kurzweil often says this. In most of them, is inserted and deleted to the legal institutions. In the Peruvian State to adopt the codes by customary law or legislative decree in case of delegation of authority and when you compose a single text approved by Decree Supreme as in the case of the Tax Code, contained in Supreme Decree 135-99-EF. 27.