San Diego Union-Tribune

March 15, 2007_Calexico, CA_Streetlights and flashing advertisements at the U.S./Mexico border, illuminate the inside of a bus at 4:30 a.m., where workers wait to be driven to nearby fields in Imperial Valley or Yuma, Arizona, in search of day-work harvesting produce._Mandatory Credit photo by Laura Embry/San Diego Union-Tribune/Zuma Press, copyright 2007 San Diego Union-Tribune

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March 15, 2007_Calexico, CA_Streetlights and flashing advertisements at the U.S./Mexico border, illuminate the inside of a bus at 4:30 a.m., where workers wait to be driven to nearby fields in Imperial Valley or Yuma, Arizona, in search of day-work harvesting produce._Mandatory Credit photo by Laura Embry/San Diego Union-Tribune/Zuma Press, copyright 2007 San Diego Union-Tribune