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The owner of Montana Buds, the statewide medical marijuana dispensary network, pleaded guilty to federal drug trafficking charges in Missoula on Wednesday.

Charlton Victor Campbell faces a minimum 10 years in federal prison when he is sentenced June 16. He could also be fined up to $10 million and will be on supervised release for at least five years after his prison term ends.

At the start of the year, 40-year-old Campbell signed a plea agreement with federal prosecutors under which he pleaded guilty to conspiracy to manufacture and distribute marijuana in exchange for three other charges being dismissed.

As part of the agreement, Campbell agreed to forfeit $30,000 in cash and will give up all the Montana Buds properties in Bozeman to the federal government. He remains released on supervision pending sentencing.

Jesse Walter Campbell and Michael James Mason have also been charged in the case, but are fighting the federal government’s right to prosecute them. They cite a Ninth Circuit Court of Appeals ruling that upheld a federal regulation and found that the Department of Justice can’t pursue criminal cases against people who are obeying their state’s medical marijuana laws.