On the trail with the US Department of Homeland Security's Shadow Wolves, the department's only Native American tracking unit, along the Arizona-Mexico border.
In the seemingly endless desert wasteland of the Arizona-Mexico border, amid 30ft high cacti and thorny mesquite trees, an eagle-eyed Native American scout has found what he is looking for.
A freshly dislodged leaf from a Creosote bush is his first sign, followed by a snapped branch still wet to the touch. Nearby, a shiny patch of dirt shows where suspected drug smugglers have tried to evade his ancient skills by brushing over their vehicle's tyre tracks with a tree limb.
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My Comment: Not a safe or easy job .... we are fortunate that some are willing to do it.