Соответствующая норма
Brunei Darussalam
Practice Relating to Rule 73. Biological Weapons
In 1991, during a debate in the First Committee of the UN General Assembly, Brunei Darussalam declared that it had prohibited biological weapons. 
Brunei Darussalam, Statement before the First Committee of the UN General Assembly, UN Doc. A/C.1/46/PV.20, 28 October 1991, p. 38.