lisa kaneb. ♪ (dogs barking) (clangin ♪ >> smith: the border spans over 1,900 miles.y 700 of them have a wall or a fence. where there are gaps, rostat blimps surveil from above. (radio chatter) since 9/11, security is up. er the numbf border patrol agents has doubled to some 20,000. >> these two are probably the guides for a larger group. minors come up north buthen went south. >> smith: in mid-june, a young woman and her son from el salvador took a raft across the rio grande into southern texas. >> that one looks pretty ung... >> yeah, but they've been trying all day to... >> smith: after several hours of wandering in the hot sun looking for help, ey found some border patrol agents and asked for asylum. after 24 hours in a hoing cell, they were released. (people talking in background) i met them at this shelter in mcallen, texas, maritza amaya and her nine-month-old son wilfredo. de donde viene? >> de el salvador. >> smith: de el salvador. they crossed the border at a time when many families were being separated. so tell us youstory about why you came at this time? (