WORTHINGTON — A Minnesota farmer who pleaded guilty to selling raw milk is accused of violating terms of his parole.

A prosecutor in Sibley County has asked a district court judge to order the arrest of Michael Hartmann. A State Patrol trooper stopped the rural Gibbon farmer last week in Anoka County and discovered that he was transporting unpasteurized milk for sale. Under state law, raw milk can only be sold on the farm where it’s produced.

Defense attorney Zenas Baer said Hartmann has a constitutional right to sell the milk. In 2010, state officials said Hartmann’s unpasteurized products sickened more than a dozen people.

A hearing date hasn’t been set yet on the request to jail Hartmann.