Related Rule
Solomon Islands
Practice Relating to Rule 72. Poison and Poisoned Weapons
In its written statement submitted to the ICJ in the Nuclear Weapons case in 1995, Solomon Islands stated: “International law prohibits the use of weapons which: … are poisonous.” 
Solomon Islands, Written statement submitted to the ICJ, Nuclear Weapons case, 19 June 1995, p. 62, § 3.77.
In its oral pleadings before the ICJ in the Nuclear Weapons case in 1995, Solomon Islands stated that the use of poisonous weapons was formally prohibited by Article 23(a) of the Hague Regulations of 1899 and 1907. 
Solomon Islands, Oral pleadings before the ICJ, Nuclear Weapons case, 14 November 1995, Verbatim Record CR 95/32, p. 47.