No witness has been more important to the prosecution's case against Curtis Flowers than Odell Hallmon. He testified in four trials that Flowers had confessed to him while the two men were in prison together. Hallmon has an astonishingly long criminal history that includes repeated charges for drug dealing, assault, and robbery. So how reliable is his testimony and did he receive anything in exchange for it? In this episode, we investigate the veracity of the prosecution's star witness.