Chapter 5
Miscellaneous
Schedule 1
Crimes
Part 3
War Crimes
'War crimes' mean any of the following:
(b) Other serious violations of the laws and customs applicable in international armed conflict, within the established framework of international law, namely, any of the following conduct:
(xviii) employing asphyxiating, poisonous or other gases, and all analogous liquids, materials or devices.
EDIT.