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A woman fighting the DAPL pipeline at Standing Rock made a video describing chemical warfare being used against protesters.
She described a November 14 incident where helicopters were encircling protesters at night with no lights on. She says from 1:40 to 2:20 am, an aircraft was circling the encampment. Then, at 5:30 am an aircraft was observed that looked like a crop duster: she described 2 hoses under each wing and suspects they were spraying some kind of chemical or bacterial agent on them.
The history of biological, chemical warfare on US citizens is a long, long history that continues to the present day. To explore this history, we made this comprehensive video/article.