Indeed, the treaty does not give a general exception to «
Riot Control Agents», and that term is only used in connections with other prohibitions (Art. 1 para 5: «Each State Party undertakes not to use
riot control agents as a method of warfare»; Art.
In other words, one could reasonably infer that the convention is not intended to prohibit use of
Riot Control Agents for the purpose of (internal) law enforcement — mace is legal — but they can not be used in warfare.