Prosecutors say 60-year-old James Postlethwaite was part of a vast criminal organization that smuggled large amounts of marijuana into the United States and cocaine into Canada.
They say the North Vancouver, B.C., man used a hidden compartment in his semi to bring hundreds of pounds of "BC Bud" to a Seattle warehouse.
The drug ring was transporting and selling as many as 2,000 pounds of marijuana each month, according to the US Attorney's Office. The same group was smuggling as many as 100 kilos of coke into Canada every month.
Postlethwaite was arrested in March when he tried to drive a different truck into Idaho. During his three-day trial, testimony revealed the pot belonged to a Canadian chapter of the Hells Angels biker gang.
In addition to Postlethwaite, two dozen other people in the United States and Canada have been charged in the case, and seven have already been sentenced to lengthy prison terms.
Over the course of the investigation, law enforcement seized more than $2 million in cash and 136 kilograms of cocaine
When he's sentenced in March, Postlethwaite will face a mandatory minimum 10 years in prison.