Erik Molvar

The M-44 is a spring-loaded device that realeases sodium cyanide when triggered. This particular device used a non-toxic substance since it was for a demonstration in Lewistown, June 21, 2019.
Rachel Cramer / Yellowstone Public Radio

While a federal agency recently reauthorized a poison used in a predator-killing cyanide trap, more states are banning or limiting where they can be used. That includes around 10 million acres of public land in Wyoming.

A coyote hunts for small mammals in the tall grass, October 2008.
Vince O'Sullivan/FLICKR (CC BY-NC-ND 2.0)

About a dozen states – including Montana and Wyoming – are allowed to use a controversial device called the M-44. Advocates say it’s an important tool to protect sheep from coyotes. Critics call it a ‘cyanide bomb’ and say it’s too risky for humans and pets. Now, several environmental groups are pushing to ban them at the state and federal level.