FOR IMMEDIATE RELEASE: August 21, 2026


CONTACT: 
Brooks Fahy, Predator Defense, (541) 520-6003, brooks@predatordefense.org




Pocatello City Council unanimously opposes M-44 "cyanide bombs" being manufactured in city limits


Mansfield family testifies against depot in their city continuing to supply the nation with poison devices that indiscriminately kill dogs and wildlife, and almost killed a child




EUGENE, OR — Last night the Pocatello City Council voted unanimously against the continued manufacture of M-44s within their municipal limits. These devices, which eject Category 1 sodium cyanide poison, are primarily used by federal agents to kills coyotes, but they kill wildlife indiscriminately, have killed thousands of dogs, and have harmed many humans. The resolution, which passed 6-0, opposes the assembling, manufacturing, stockpiling and distributing of M-44s in Pocatello and urges the federal government to cease production there.


The entire nation's supply of these poison devices is manufactured in an inconspicuous looking brick building called the Pocatello Supply Depot (pictured below). It has a fenced-in parking area that looks pretty much like most warehouses, but is not. Pocatello was the location of the most infamous M-44 poisoning incident to date on March 16, 2017, which is when the city's police department and emergency responders discovered that this facility produced and distributed some of the deadliest poisons on earth, including what quickly became referred to by the public as M-44 "cyanide bombs."


That was the day 14-year-old Pocatello resident Canyon Mansfield took a customary walk with his beloved dog Kasey on a hill just 300 yards from home and saw what he thought was a sprinkler head. When he touched it, a cloud of orange poison powder shot into the air, poisoning him and his dog. Kasey died an agonizing death in front of him. Canyon was believed to have only been spared death due to wind direction, but long suffered severe and painful effects from the poisoning. The Mansfield family has worked hard to ban these devices and want others across the country to know the reality of just how deadly cyanide bombs are. They spoke on this at last night's city council meeting.


Theresa Mansfield, mother of 2017 M-44 cyanide bomb victim Canyon Mansfield, stands in front of the Pocatello Supply Depot with Brooks Fahy, executive director of the wildlife nonprofit Predator Defense, which has long worked to ban M-44s. The Pocatello Supply Depot is the only place in the nation where M-44 sodium "cyanide bombs" are manufactured.



"There's a cruel, tragic irony in the fact that the very device that poisoned me and forced me to witness my dog’s death was manufactured and built only miles from my home, in my city that used to feel so familiar," said Canyon Mansfield. "Stranger still, that the Depot responsible was the sole supplier for the entire United States. My sense of sanctuary was shattered, and my safe hometown became just an illusion of the past."


Global public outcry exploded after the 2017 incident, and a subsequent APA petition and litigation led to Idaho now going almost 10 years without using M-44s, pending a full Environmental Impact Statement. 


"While I am powerless to change what happened to my son, this resolution is very meaningful and should spark change," said Dr. Mark Mansfield, father of Canyon. "There is no safe or targeted way to use an indiscriminate poison device. Legislative intervention for a federal ban is necessary, as cyanide bombs are coming back to BLM lands right now as we speak."


M-44s have injured dozens of people to date, contributed to a Utah man's death, and inhumanely killed thousands of animals every year, including endangered species and dogs. Additionally, USDA Wildlife Services whistleblowers report that countless nontarget animal deaths go unreported. Experts repeatedly mention that there is no way to use M-44s safely, as no dog, wild animal or child can read warning signs.


“Working closely with M-44 cyanide bomb victims since 1994, I have witnessed what these indiscriminate devices have done to families who have lost beloved pets, been poisoned themselves, or potentially lost a child,” said Brooks Fahy, executive director of Predator Defense. “Countless people have been traumatized. The emotional scars are permanent."


In their efforts to ban M-44s, Predator Defense has helped facilitate multiple, ongoing introductions of federal legislation now known as "Canyon's Law." They have also helped achieve statewide bans that created a West Coast free of M-44s and a 2023 ban on all 245 million acres of BLM land. This spring when they heard the administration decided to allow M-44s to return to almost all BLM lands, they mobilized numerous victims of M-44 devices and sent a heartfelt and highly detailed letter to top federal officials, Doug Burgum, Secretary of the Interior, and Stevan Pearce, Director of the Bureau of Land Management, urging them to not to return the devices for predator control, due to public safety concerns. The letter also features lists of incidents and deaths and key observations from experts, including physicians, a veterinarian, a scientist, a former wildlife agent, and a former Congressman.


"While this Pocatello vote is a symbolic act, not a legal one, it sends a powerful message to the federal government of how strongly the public feels on the issue," said Fahy. "No one has forgotten. This Depot has brought nothing but pain and misery to this community and is a constant reminder of the insanity of the government's predator poisoning campaigns. This city council action should be a a vivid wake-up call to federal officials to voluntarily withdraw these devices before one kills a child." 


"I have always loved Pocatello and believe we live in the greatest place on earth," said Dr. Mansfield. "In 2017, the people of Pocatello rallied around this issue and showed my family love. Tonight, they did the same, passing this resolution on a vital public safety issue with a unanimous vote. They have done what is righteous to protect people, pets and wildlife."


"Despite the bitterness that still grips me when I happen near [the Supply Depot], I still hold much faith in my city," said Canyon Mansfield to the councilmembers before their vote. "Faith that my family’s suffering wasn’t in vain; faith that Kasey’s death would enact change. The faith that you, who have been entrusted to lead, bear our community’s best interests in mind. And so, I have come here, guided by this sense of faith to stand here and ask, that when you cast your vote, you prove this faith right."


They did just that.


# # #



Predator Defense is national nonprofit advocacy organization that has championed wolves, coyotes and other native predators with science, sanity and heart since 1990. They are devoted to helping people learn to coexist with wild animals and to ending America's war on wildlife. 

Predator Defense | predatordefense.org

Facebook  Twitter  Youtube