A former sheriff's deputy in Tulia, Texas, is convicted on a charge of aggravated perjury. In 1998, 46 residents of Tulia were charged with selling cocaine. Most were black. The cases were based entirely on the word of undercover deputy Tom Coleman. The convictions were eventually thrown out, and Coleman was convicted of one of two perjury charges against him. Hear NPR's Robert Siegel and NPR's Wade Goodwyn.