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

“There’s no reason to have pain inflicted on you if you haven’t done anything wrong.”

“Now I don’t go around the feds without a gas mask.”

Krus has modified a respirator in preparation for a new wave of protests in the spring. Photo: Logan Krus

Lynne Peskoe-Yang is a science and technology reporter.

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