The relatively rare, forest-dwelling fisher is increasingly becoming the innocent victim of illegal marijuana farms in forested lands in California. According to a recently published study, researchers found that the annual rate of poisoning deaths of fishers (Pekania pennant) rose 233 percent compared to a study in 2012. The toxicants were discovered to be associated with illegal marijuana farms on public and tribal lands in Northern and Southern California.
http://www.sciencedaily.com/releases/2015/11/151104151002.htm