U.S. Customs And Border Protection Secures Tex-Mex Border From Land, Air and Sea

PORT ISABEL, TX - APRIL 12: Marine interdiction agents from the U.S. Office of Air and Marine (OAM) cut a dead shark loose from an illegal fishing line while on a patrol in the Gulf of Mexico on April 12, 2013 near Port Isabel, Texas. OAM units patrol coastline waters near the U.S.-Mexico border searching for drug smugglers as well as illegal immigrants, which come across from Mexico near the mouth of the Rio Grande River. Their Midnight Express interceptor is a 39 foot 900 horsepower craft capable of chasing smugglers down at 55 knots (63 mph). OAM patrols also push back illegal fishing boats out of U.S. waters. (Photo by John Moore/Getty Images)