The Trump administration is quietly resetting the rules on federal public lands, reopening the door to the limited use of M-44 sodium-cyanide ejector devices, better known as "cyanide bombs." A recently surfaced internal memo from April tells Bureau of Land Management staff that the devices are tools that "may be considered" under existing authorities and environmental review. That shift has conservationists and some lawmakers warning that hikers, pets and wildlife could once again be placed in the line of fire, potentially undoing years of work to keep lethal cyanide ejectors away from popular recreation areas.
The April guidance memo, reviewed by The New York Times, tells BLM field offices they should be notified when Wildlife Services proposes using "restricted-use pesticides such as... M-44s that deliver sodium cyanide" and that these devices can be weighed under existing laws and environmental review processes. According to the Times, the document circulated in April among Interior and BLM officials and marks a clear departure from the bureau's more restrictive 2023 posture.
What Are M-44 'Cyanide Bombs'?
M-44 ejector devices are spring-loaded stakes baited to lure coyotes and other predators. When an animal tugs on the bait, the device blasts out a powdered sodium-cyanide capsule that quickly turns into hydrogen cyanide gas. A USDA-APHIS human health and ecological risk assessment found that each capsule carries enough cyanide to be lethal and that the devices pose a measurable risk to nontarget animals and people. The tools drew national attention after a 2017 Idaho incident in which a teenager touched an M-44, killing his dog and sending him to the hospital, a case reported by National Geographic and documented in APHIS materials.
BLM's 2023 Ban - What It Changed
In February 2024 the Bureau of Land Management issued an information bulletin putting into effect a 2023 memorandum of understanding that barred M-44 devices from BLM-managed lands. The agency noted that less than 1 percent of Wildlife Services' M-44 deployments took place on BLM acreage but still cited past incidents as reason enough to keep them off its turf. The bulletin also said BLM would update its manual to spell out the prohibition. BLM outlines its reasoning in the document.
Lawmakers And Advocates Push Back
On Capitol Hill, federal lawmakers have been pushing "Canyon's Law," a proposal that would ban M-44 devices on all public lands. H.R. 4180 and its companion language in the Senate would prohibit preparing, placing or deploying M-44s on federal public lands. Conservation organizations praised BLM's earlier ban and now argue that the new memo undercuts hard-won protections. The Animal Welfare Institute, which had called BLM's move a meaningful safety measure, warns that reopening consideration of M-44s again places visitors and wildlife at risk. The bill text is posted on Congress.gov, and the advocacy group's reaction is detailed by the Animal Welfare Institute.
How This Would Work - And The Risks
Even if BLM now allows M-44s to be "considered," the devices would still be set and managed by USDA-APHIS Wildlife Services under existing EPA pesticide registrations and APHIS directives. Those directives require certified applicators, posted warning signs and specific training. An APHIS risk assessment notes both the device's effectiveness against target canids and the potential for nontarget and human exposures, which opponents say have already led to accidental poisonings. Critics argue that once the bureaucracy says M-44s may be considered, it effectively reopens the door to putting them back on public lands.
How To Stay Safe On Public Lands
For anyone heading out to hike, camp or walk the dog, the patchwork of land managers and predator-control programs means a little extra vigilance is in order. Keep dogs leashed, especially near grazing allotments. Avoid wandering off established trails in areas where livestock graze. Check in with your local BLM field office for current notices and any predator-control advisories. If you stumble on a suspicious stake or baited device, do not touch it. Instead, report it immediately to local law enforcement and to the nearest BLM or Wildlife Services office. For past policy details and safety guidance, see BLM.
The policy landscape around M-44 use is shifting quickly, and more memos, statements and political responses are likely to follow. This story will be updated as agencies, lawmakers and advocates weigh in and as additional documents surface. In the meantime, anyone using public lands should treat the current guidance as provisional and check with local field offices for the latest word before heading out.
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