Somewhat interesting article from The New York Times. It begins:
TOHONO O’ODHAM NATION, Ariz. — 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.