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Immigration Border Crisis

Drones Replace Boots on Ground at Mexico Border: AP Sources

Smugglers Instill Fear Along U.S. Border 2:56

SIERRA VISTA, Ariz. — The U.S. government now patrols nearly half the Mexican border by drones alone in a largely unheralded shift to control desolate stretches where there are no agents, camera towers, ground sensors or fences, and it plans to expand the strategy to the Canadian border. It represents a significant departure from a decades-old approach that emphasizes boots on the ground and fences.

Since 2000, the number of Border Patrol agents on the 1,954-mile border more than doubled to surpass 18,000 and fencing multiplied nine times to 700 miles. Under the new approach, Predator Bs sweep remote mountains, canyons and rivers with a high-resolution video camera and return within three days for another video in the same spot, according to two officials with direct knowledge of the effort on condition of anonymity because details have not been made public. The two videos are then overlaid for analysts who use sophisticated software to identify tiny changes — perhaps the tracks of a farmer or cows, perhaps those of immigrants who entered the country illegally or a drug-laden Hummer, they said. The government has operated about 10,000 drone flights under the strategy, known internally as "change detection," since it began in March 2013. The flights currently cover about 900 miles, much of it in Texas, and are expected to expand to the Canadian border by the end of 2015.

- The Associated Press