Sunday, September 8, 2002 Danger funnels northward Camino del Diablo, in southwestern Arizona, is so heavily traveled by agents and smugglers that its surface is called "moon dust." Stand by your lands: Vergial Harp, of the U.S. Fish and Wildlife Service, has a semiautomatic rifle at the ready while traveling in the Cabeza Prieta National Wildlife Refuge southeast of Yuma. The Border Patrol's Alex Chavez drives a dozen border crossers to the Lukeville port of entry, where they will be photographed, fingerprinted and sent packing to Mexico. Flow of drugs, people places lives at riskStory by Mitch Tobin Photos By...