On July 29th, 2020 federal agents of the Department of Homeland Security deployed unknown chemical agents via a thermal fogger on racial justice protesters outside the Hatfield Federal Courthouse in Portland, Oregon.

Fully riot-geared and for some reason in green camo US Homeland Security agents (to the middle and the left of the photo) behind a row of two-foot tall, one-foot radius metal posts, behind a metal grate wall over 7 feet tall with metal support beams and concrete pylon buttressing. In the front of the left side is an agent holding a plastic clear riot shield, through which you can see a patch that say 'Border Patrol Federal Agent' in yellow and some insignia patches as well. In the middle are the agents in camo, one with a hand on the shoulder of another who is operating a thermal fogger machine shooting gas through the fence. The machine is maybe four or five feet long and has a body not unlike a bush whacker with a two-cycle engine, but fueling a vaporizer instead of a rotor. The agent is holding the machine with their right hand visibly and there is a black strap across their shoulder holding it up. The machine is mostly shiny metal, although the tip is showing signs of corrosion (no surprise based on the compounds and heat) and the supports of the body are a bright green. source:
US DHS agent deploying chemical agent via thermal fogger, Portland OR, 7/29/2020; D. Brown

In awakening a dormant Foucault’s Boomerang (Graham 2013), DHS instantly made a large swath of the populace aware of an insidious weapon that was birthed in the American occupation of Vietnam and perfected for use against domestic protesters in the 1960s and ’70s.

Despite repeated use of thermal foggers to deploy chemical weapons over the last half century, the device appears to have slipped from the zeitgeist, only to reemerge in the city which experienced the most visible novel federal deployment of chemical weapons, the most chemical weapons-based incidents of police brutality at racial justice protests across American cities (regardless of population size), and an notable density of photographers and videographers (both professional and amateur).

Not all of the weapon’s history is documented, but enough is that we can dispel the myth that this deployment was new in any notable sense other than being recent.

Indeed, through this work, I (Dr. Juniper L. Simonis) have discovered an extensive history of its deployment and can say that I feel a deep connection to my protest elders who experienced thermal foggers decades ago, and I hope that my work will bring light to their stories. We are but the most recent chapter in a long history of United States Law Enforcement using chemical weapons against its own populace.