A Council Bluffs man who showed up at the Pottawattamie County Sheriff’s Office, Monday, to update his sex offender registry, was arrested on a warrant. Records indicated 27-year old Zachary Dekota Olson was wanted on a current active warrant for Failure to Comply with the Iowa Sex Offender Registry/2nd or subsequent offense. Olson was taken in to custody and transported to Corrections where he was read the warrant. He was then handed over to Corrections Staff.