A traffic stop Saturday morning in Pottawattamie County resulted in the arrest of a man on drug charges. The Sheriff’s Office reports 21-year old Tanner Joseph Mathews, of Treynor, was taken into custody for Possession of a Controlled Substance and Possession of Drug Paraphernalia. His arrest occurred after a deputy pulled over a 2007 Ford Fusion for speeding at around 3-a.m. Saturday, on Old Lincoln Highway at the intersection with the Old Mormon Bridge road.  14.5-grams of marijuana was recovered at the scene, along with marijuana pipes and a marijuana grinder.