And if a predator preys on an infected animal, the poison can affect that species as well.
DPR is currently considering making SGAR California Restricted Materials, meaning they would only be available to certified applicators.
Click here to view DPR's assessment of SGAR
“If we’re finding it in the Fisher, we can extrapolate to so many different species,” Gabriel said.
Gabriel calls the fisher the “species of light” because he believes the fishers’ deaths will shed light on a bigger issue: the fatal effects of SGARs on wildlife.
Gabriel has found at least two endangered spotted owls have been exposed to the toxicants and scientists fear the Sierra Nevada red fox and Humboldt marten are also at risk, since they share the same environment.
The Investigative Unit traveled to Gabriel’s Humboldt lab where in the nearby Sierra Forest and on the Hoopa Valley Reservation he and biologist Mark Higley set up cameras to track the fishers.
To see more video of the fishers view click here.
The Unit hiked into one of those recently abandoned marijuana grow sites to see piles of trash and containers of pesticide left after growers finished the season’s crop, in the middle of the fishers’ habitat and close to the water supply.
“It’s basically flowing with the water and then it’s picked up by those species that can use it most readily,” Higley told NBC Bay Area on the hike.
Higley says the poisons, trash and fertilizer can travel in the water that is used by hikers and locals.
This study shows how these chemicals and algae in the water that can be toxic to animals and humans.
“I don't want to drink out of the creek now and come home and not wake back up,” said Dawn Blake, a member of the Hoopa Valley Tribe who lives on the reservation.
Blake believes it’s only a matter of time before toxicants in the water could make those in her community sick.
“They are specifically targeting animals and anything that can kill a bear is going to kill me as well,” Blake said. “Marijuana operations are destroying the landscape.”
Last year the state group called the Joint Task Force Domestic Support Counterdrug spent $23 million hunting down and seizing marijuana plants on public land in California as well, but little public funding is set aside for clean-up of the trash and poison left behind.
“They are killing the animals and killing the forest and they don’t care,” said Rick Fleming, a hiker who heads up the volunteer group the High Sierra Trail Crew to clean up the grow sites. “And you know that’s the reason we volunteer.”
Fleming believes the state should give more funding to the cleanup, not just the seizing of the plants, because that’s what’s impacting the environment.
Fleming says the biggest challenge is getting to the sites.
“They don't want to be detected, so you have to hike in miles or be brought in by helicopter in order to get there,” Fleming said. “Then you have to bag everything up.”
The former leader of the High Sierra Trail Crew, Shane Krogen, was killed in September after falling out of a helicopter when trying to clean up a site.
“I don’t believe they have the right to go out there and trash my forest,” Fleming said with emotion in reference to his friend’s death. “The national forests and the national parks are our legacy and they are being trashed.”
That legacy of resources and wildlife protected in our national parks is being harmed by illegal growers.
“The rest of our nation is not fully aware of what’s happening here in California, and it just doesn’t affect our state,” Gabriel told NBC Bay Area. “These are our national treasures, these are our national forests.”