Police arrested a Mississippi man on Friday and seized drugs, guns and more then $130,000 in cash. David Walls, 45, of Hattiesburg, was arrested on a charge of trafficking a controlled substance after a year-long, joint investigation by the Hattiesburg Police Department and the Drug Enforcement Administration. Walls was arrested early Friday morning during a coordinated enforcement operation in the 600 block of Buschman Street in Hattiesburg. During the investigation, authorities seized 90 grams of crack cocaine, eight firearms, three vehicles and more than $130,000 in cash. Walls was taken into custody without incident.