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Cutting for Sign

Border Patrol Agent Rush Carter on the Rio Grande. Photo: Lorne Matalon for KRTS.

When it comes to finding people like drug traffickers or undocumented aliens in the wilderness of west Texas, law enforcement uses technology like sensors, drones and helicopters.

But agents also use a technique perfected by Native Americans called "Cutting for Sign," looking at the ground for signs to a person's movement.

Lorne Matalon reports from the Texas-Mexico Border.