Rodenticides at Marijuana Grow Site (IMAGE) University of California - Davis Caption This is Mourad Gabriel of the Integral Ecology Research Center stands amid an illegal marijuana grow site in Northern California. Gabriel led research with UC Davis connecting rat poison at such sites to the deaths of fishers, weasel-like mammals proposed for federal listing as a threatened species. Credit Mark Higley/Hoopa Valley Tribal Forestry Usage Restrictions Provide credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.