A Massena man was arrested after a traffic stop on State highway 11 in the town of Potsdam. State Police say he was doing about 10 miles per hour in a 55 mile per hour zone. He sped up to about 70 MPH and passed a car in a no passing zone, then pulled over. The driver, 24 year old Kody Larock was arrested for operating while impaired by drugs. He also had more than 10 pounds of marijuana with him, so additional charges were added. Larock is now in the St. Lawrence County Correctional Facility.