TUCSON, Ariz — Federal officials will begin installing steel pole barriers this month to stop drug and migrant smugglers from driving through what have been high-traffic corridors along sections of the Mexican border in Arizona and New Mexico. The poles, which will be spaced about four feet apart, will be placed along two miles of border east of San Luis, Ariz., and along a one-mile stretch west of Columbus, N.M., in areas frequented by smugglers using cars, pickups and vans. The barriers have previously been used near San Diego. Officials say smugglers driving around the barriers will go into isolated...