An 80-year-old man faces sentencing in U.S. District Court in Boston for running a large multistate marijuana operation for years.

Prosecutors in Boston agreed to a plea deal from Marshall Dion, 80, who could be sentenced to up to seven years in prison on Thursday afternoon for having distributed marijuana for decades, WHDH reported.

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Prosecutors said in a court filing that Dion “had been trafficking in large amounts of marijuana since at least 1992,” the Daily Mail stated.

Dion’s drug-smuggling career included several interesting run-ins with police, including a 1985 Wisconsin single-engine plane crash that left a field strewn with cash, which Dion denied was his, even though he was piloting the small plane, WHDH added.

In 1989, Dion was convicted of drug trafficking after police found more than 100 pounds of marijuana in his car, the Daily Mail reported. Most recently, Dion was stopped for speeding in Kansas in 2013, and officers found nearly $850,000 in his pick-up truck.

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That stop ultimately led officers to uncover approximately $15 million in cash, 400 pounds of marijuana and drug-dealing records dating back to 1992, WHDH added.

Despite the millions authorities recovered, Dion seemed to live frugally, according to the Daily Mail.