According to the Chemical Weaponss Convention, tear gas is a "Riot Control Agent", not a "Chemical Weapon". See https://www.opcw.org/chemical-weapons-conventio

According to the Chemical Weaponss Convention, tear gas is a "Riot Control Agent", not a "Chemical Weapon". See https://www.opcw.org/chemical-weapons-convention/articles/article-ii-definitions-and-criteria https://www.opcw.org/chemical-weapons-convention/articles/ar... .