Interrogators Think They Have A Wolf In Shepherd Clothing A GPS Device and $30,000 Raise a Few Eyebrows At a Desert Checkpoint "The suitcase, the money, the book, the GPS with the grid positions of U.S. troop movements. Sheepherders don't carry that stuff around" Twenty miles west of Samawah, Iraq -- Four Iraqis cruising the barren desert in a white Toyota pickup at noon, came across a U.S. military checkpoint set up here to catch spies helping coordinate sniper attacks on U.S. convoys. As those convoys advanced toward Baghdad, 140 miles to the north, U.S. forces were focused on protecting...