CBS News correspondent Mireya Villarreal travels to the Tohono O'odham reservation, which straddles 75 miles of the U.S.-Mexico border. This little-seen corner of Arizona is an area rife with drug traffickers, coyotes and migrants looking to enter the U.S. Members of the Tohono O'odham tribe who live here have managed to keep their culture alive in spite of an international border that bisects their ancestral land and separates families on either side. But they fear the wall will destroy it.