They have turned a gigantic warehouse into a makeshift morgue in the Louisiana town of St. Gabriel. Doctors and forensic specialists wait there for the bodies to come in, bodies with no identification, bodies that have spent days submerged in water, bodies gnawed by dogs and rats and 'gators. The doctors have posted a hand-lettered sign on the wall: "Mortui Vivis Praecipant." It means, "Let the dead teach the living."