Congress doesn't have the authority to legislate on marijuana if it's grown, harvested, sold, and consumed/used all in the same state as the interstate commerce clause cannot be used. In California, several county sheriffs had publicly said that they would arrest DEA agents if they tried to enforce federal law in California. Historical precedent for this practice dates back to shorty before the civil war where the Milwaukee Sheriff arrested two US Marshall agents for kidnapping because they were trying to enforce the Fugitive Slave Act. This particular sheriff is flat-out committing theft and abusing his authority; he needs to go to jail for a very long time.