http://stream.publicbroadcasting.net/production/mp3/kunm/local-kunm-986546.mp3
The 9-11 terrorists entered the country legally. But the attacks forever changed public attitudes toward our nation's borders and in many cases, toward immigrants. Border security became a rallying cry. Now, a decade after the Twin Towers fell, U-S borders are much more protected. But as Hernán Rozemberg reports from the Fronteras Changing America Desk, experts believe they can never be absolutely secured.