About a month after an anti-predator device spit sodium cyanide in the face of an unsuspecting boy and killed his dog, the U.S. Department of Agriculture has announced it is ending its use of the M-44 mechanisms in Idaho indefinitely.

"We take seriously the incident in Idaho," Jason Suckow, western regional director of the USDA's Wildlife Services agency, told conservation groups in a letter Monday. "We immediately responded by removing all M-44s from the area, initiating an inquiry into the incident, and launching a review of current [Wildlife Services] operating procedures."

Suckow noted the agency has "removed all M-44s currently deployed on all land ownerships in Idaho" and has refrained from planting new ones.