Montana Wildlife Services

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.