On 7 February 1992, Europol was enshrined with more substance in Article K.1, section 9, as the Maastricht Treaty was signed:[...] Member States shall regard the following areas as matters of common interest: [...] police cooperation for the purposes of preventing and combatting terrorism, unlawful drug trafficking and other serious forms of international crime, including if necessary certain aspects of customs cooperation, in connection with the organization of a Union-wide system for exchanging information within a European Police Office (Europol).Europol was first de facto organised provisionally in 1993 as the Europol Drugs Unit (EDU) in Strasbourg at the same site as the Schengen Information System was hosted.