Related Rule
South Africa
Practice Relating to Rule 75. Riot Control Agents
South Africa’s LOAC Teaching Manual (2008) states:
3. Means and Methods of Warfare
Several specific weapons are governed by specific treaties. These treaties establish two categories of weapons, to wit[:]
- Weapons of which the use is totally prohibited; and
- Weapons of which the use is permitted under certain conditions.
Weapons of which the Use is Totally Prohibited
- Chemical and bacteriological warfare, …
Weapons of which the use is Permitted under Certain Conditions:
- Tear Gas. Tear gas may only be used during internal operations as a crowd management measure. 
South Africa, Advanced Law of Armed Conflict Teaching Manual, School of Military Justice, 1 April 2008, as amended to 25 October 2013, Learning Unit 3, pp. 174–175, 176 and 179.
[emphasis in original]