相关规则
Philippines
Practice Relating to Rule 72. Poison and Poisoned Weapons
On the basis of an interview with a high-ranking officer of the Armed Forces of the Philippines, the Report on the Practice of the Philippines notes that poison is prohibited. 
Report on the Practice of the Philippines, 1997, Interview with Navy Lt. Office of the Deputy Chief of Staff for Intelligence, 5 March 1997, Chapter 3.2.