California has a legal cannabis industry —but not all of it is legal. While licensed dispensaries dominate headlines, law enforcement says the black market still thrives, especially along Interstate 5 in Northern California.
This major corridor has become a pipeline for illegal marijuana shipments moving between California and the Pacific Northwest, raising concerns about enforcement and federal funding.
Here’s what to know about cannabis smuggling in California.
Why I-5 remains the Black-Market artery
Interstate 5 has long been the backbone of illegal marijuana transportation in the western United States. Linking California’s Central Valley to Oregon and Washington, the corridor moves more than just crops—it moves cash, weapons, and people.
Shasta and Siskiyou counties sit squarely on this route, making them prime targets for law enforcement.
“Drugs move north and the money goes south,” said Shasta County Sheriff’s Lt. Chris Van Eyck. Siskiyou deputies reported two of the year’s biggest busts during Thanksgiving week, including a box truck carrying 1,429 pounds of marijuana and another hauling 2,184 plants bound for Seattle.
Two of the North State’s biggest illegal marijuana busts during routine traffic stops the week of Thanksgiving, according to Milestone.
When deputies stopped a rented box truck for a lighting violation at Grenada — located on the interstate approximately 11 miles south of Yreka — they found more than 1,429 pounds of illegal marijuana products stowed in 62 trash bags in the truck. The 43-year-old driver from Willits allegedly “confirmed” he was moving the illegal marijuana from the Mount Shasta area, according to the sheriff’s office. He was then arrested on suspicion of transporting and possessing illegal marijuana for sale and booked into the Siskiyou County Jail.
A similar traffic stop in Mount Shasta yielded an illegal stash of 2,184 recently cultivated marijuana plants in 28 boxes in the back of a Home Depot box truck with an expired registration. The 46-year-old driver from San Lorenzo in the East Bay Area allegedly told deputies he was driving the plants to Seattle. He was arrested and cited for the transportation of marijuana for sale, the Siskiyou County Sheriff’s Office reported.
Holiday hash aside, summer is the busiest time for illegal marijuana transportation, according to the Siskiyou County Sheriff’s Office.
- In late May, deputies arrested a 49-year-old Sacramento County woman when she allegedly drove more than 2,500 pounds of illegal marijuana through Siskiyou County.
- A few weeks later in June, when deputies stopped a white van speeding on I-5 near Mount Shasta, they arrested the 65-year-old Redway driver for allegedly illegally transporting and possessing 1,030 pounds of marijuana stowed in 52 large trash bags.
- In July, law enforcement stopped a U-Haul truck at Dunsmuir hauling 3,969 pounds of illegal marijuana, according to Siskiyou County Sheriff Jeremiah LaRue.
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