How does tear gas actually work?

i thought this was some sort of odd conspiracy theory, which makes the moral of the story, i guess, “believe women.”

and i found that through this article, which lists a lot more chemicals than capsaicin

The Department of Environmental Quality [said] the city must send a monitoring plan to state officials within the next three weeks describing how it will monitor for specific heavy metals and chemicals that regulators believe are likely associated with CS gas, a strong form of toxic tear gas used against protesters for months.

The state is asking Portland to collect and analyze stormwater for chromium, hexavalent chromium, lead, zinc, copper, barium and perchlorate. Most of those substances are toxic to humans at even at extremely low levels.

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