COLUMBUS, Mont. -

Two California residents have pleaded guilty to drug charges after being stopped on Interstate 90 in south-central Montana with 115 pounds of marijuana in their rental car.

The Stillwater County news reports 37-year-old Rick Franklin Voight and 41-year-old Dawn Delores Voight both pleaded guilty on July 24 to criminal possession of dangerous drugs with intent to distribute.

Under the plea agreement, both face a five-year commitment to the Department of Corrections with two years suspended when they are sentenced on Sept. 5.

They were arrested in April after a Montana Highway Patrol trooper pulled them over for speeding. Court records say they appeared nervous and gave conflicting stories about their travel plans.

The trooper asked for assistance from the Stillwater County K9 unit and officers impounded the car after the dog, Jordy, alerted on it.