Tear gas is being used on U.S. protesters: Where did it come from?

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Tear gas is being used on U.S. protesters: Where did it come from?

Health officials and police watchdog groups criticized the use of what is commonly considered “tear gas” on peaceful protesters in Washington, D.C. Experts say its use on civilians can lead to increased health risks, including coronavirus. Roxana Saberi looks at the history of the wartime chemical, and how it went from military weapon to commercial production.