TOKYO, Aug 6 (Reuters) - Japan on Sunday marked the 78th anniversary of the U.S. atomic bombing on Hiroshima, where its mayor urged the abolition of nuclear weapons and called the Group of Seven leaders’ notion of nuclear deterrence a “folly”.
Use of tear gas in domestic riot control is not a violation of the chemical weapons convention.
https://www.opcw.org/chemical-weapons-convention/articles/article-ii-definitions-and-criteria
- “Purposes Not Prohibited Under this Convention” means:
(d) Law enforcement including domestic riot control purposes.
Is it bad when used unnecessarily, especially not with a riot? Yes. But to imply that the US is commiting a war crime by using it is misleading.