"Indian Tracking" lives on along Mexican border

This is pretty cool.

A fresh footprint in the dirt, fibers in the mesquite. Harold Thompson reads the signs like a map.

They point to drug smugglers, 10 or 11, crossing from Mexico. The deep impressions and spacing are a giveaway to the heavy loads on their backs. With no insect tracks or paw prints of nocturnal creatures marking the steps, Mr. Thompson determines the smugglers probably crossed a few hours ago.

“These guys are not far ahead; we’ll get them,” said Mr. Thompson, 50, a strapping Navajo who follows the trail like a bloodhound.

At a time when all manner of high technology is arriving to help beef up security at the Mexican border — infrared cameras, sensors, unmanned drones — there is a growing appreciation among the federal authorities for the American Indian art of tracking, honed over generations by ancestors hunting animals.

Mr. Thompson belongs to the Shadow Wolves, a federal law enforcement unit of Indian officers that has operated since the early 1970s on this vast Indian nation straddling the Mexican border.