How a small town pharmacist caught his son's killer - and then took down the most notorious pill mill doctor in New Orleans historyAmong the Christmas ornaments, Mardi Gras costumes and crawfish boiling equipment in Dan Schneider's attic, a stack of cardboard boxes stands out. They bear handwritten labels scrawled with a black Sharpie: "Danny Murder Investigation," "Tunnel of Hope," "Dr. Cleggett WWEP." Schneider seldom opens them anymore. His wife wishes he would throw them away. But he insists on keeping them around. "I ain't never getting rid of this stuff," he says. Those dozen boxes archive a pivotal period...