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Robert John Ferrell (Image released by the Yellowstone County Sheriff)

A Montana man was sentenced to four years in federal prison Wednesday for trafficking methamphetamine in the Bakken region.

U.S. District Judge Susan Watters sentenced 52-year-old Robert John Ferrell of Fairview.

Ferrell was given a lenient sentence because he has diabetes and liver disease, the Billings Gazette said.

Ferrell was among a dozen people arrested for a meth conspiracy in the Bakken region of eastern Montana and North Dakota.

The meth scheme operated from August 2012 to February 2013.

Ferrell pleaded guilty in February to possession with intent to distribute meth.

Ferrell was supplied with 50 grams of “very highly pure meth” by Robert Farrell Armstrong of Moses Lake, Washington, according charging documents.

Armstrong is scheduled to be sentenced next month.

Nine other defendants have also pleaded guilty.