Pot growers who use poisons to reduce rat infestations are threatening native wildlife like the fisher in Washington & California.
The fisher, a small native predator related to the weasel, often feeds on rats poisoned by baits used extensively around cannabis plantations. Mapping of illegal cannabis plantations in north-western USA by the National Marijuana Initiative shows a distinct overlap with areas in which poisoned fishers have been found. One study in northern California found that 79% of dead fishers had rat poison in their system and many other native animals including racoons, mountain lions, bobcats, owls and hawks are also being affected.
Read more at the Seattle Times