What is riot control agent?
riot control agent meaning in Military terminology / glossary / dictionary is:
Any chemical, not listed in a schedule of the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction that can produce rapidly in humans sensory irritation or disabling physical effects that disappear within a short time following termination of exposure. Also called RCA. See also chemical warfare.
Source: JP 3-11