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

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 plumes of an unusual green smoke, too. Puddles of greenish residue seeped into the city’s storm drains. Human rights advocates and conservationists called on the local government to investigate the environmental impact of these chemical weapons, which had been deployed by the police, but no new chemicals were identified to the public.

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