Although Interpol's constitution prohibits it from becoming involved in political activities, it coordinates international efforts against terrorism by focusing on the particular crimes that terrorists have committed. The broad base of antiterrorist support from Interpol's General Assembly and the formation of an antiterrorist group at the General Secretariat has marshalled all of Interpol's communication channels and support facilities for National Central Bureaus in the fight against international terrorism. Services include nominal and case searches on the data bases, establishing linked cases, the circulating of notices on suspected terrorists, the provision of modus-operandi circulars, and the arrangement of ad hoc meetings. The General Secretariat works closely with other subdivisions, particularly the Drugs Subdivision concerning linked drug-terrorist cases. Interpol's Drugs Subdivision has two primary roles: to enhance cooperation among national law enforcement services and stimulate the exchange of relevant information among all national and international bodies concerned with drug trafficking and to strengthen the ability of national services to combat illicit drug trafficking.