The Pottawattamie County Sheriff’s Office reports a traffic stop Tuesday evening in Avoca led to the arrest of 57-year old James Allen Harriman, of Avoca. Harriman’s SUV was pulled over by a Pott. County Deputy and an Avoca Police Officer at around 4:20-p.m. The two officials believed Harriman to be under the influence of a drug other than alcohol, and requested another Deputy’s assistance. Upon further investigation, Harriman was arrested for OWI/1st offense. He was also given a verbal warning for having an expired registration.