The Bacteriological (Biological) and Toxin Weapons Convention, BTWC, which prohibits the development, production and stockpiling of biological and toxin weapons and provides for their destruction came into force in 1975. Ireland firmly supports the need for an effective compliance and verification instrument in the convention and considers that the absence of specified verification measures in the convention text are an impediment to its successful operation. A special conference of BTWC states parties in September 1994 established an ad hoc group to address the matter of devising a verification instrument in the form of a protocol to the convention. Ireland has been extensively engaged in the work of this group. In particular, Ireland has supported efforts to devise an effective verification mechanism, including random visits to possible sites of manufacture of biological weapons.