Future Human
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Future Human

Scientists Identified a Green, Poisonous Gas Used by Federal Agents on Portland Protesters

The toxic chemical is more than an alternative type of tear gas

Photo: Nathan Howard/Stringer/Getty Images

By July, Black Lives Matter protesters in Portland had become accustomed to the gray, black, and colorless tear gas that wafted through the city streets every night. But that month, they started seeing…

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Lynne Peskoe-Yang

Lynne Peskoe-Yang

Lynne Peskoe-Yang is a science and technology reporter.