The Guardian in Corpus Christi is one of two that exist in the world. The other one is based at Cape Canaveral, Florida. CPB plans to add a third Guardian by the end of the year but has not announced the location.

After sweeping the Texas Gulf Coast, the drone reached the tip of Texas, the Rio Grande Valley.

The people who run the system will work late into the night as the Predator flies over a stretch of the Rio Grande that borders a drug war hot spot in Mexico.

?Hook a right and start coming down the river into our areas,? said Chris, another agent in mission control who does not want his name used for security reasons.

?We?ll follow the river and patrol.?