Last Sunday, CBS aired its long-awaited feature on the prosecution and imprisonment of former Alabama Governor Don E. Siegelman. The CBS piece, for which I was repeatedly interviewed, came through on its promise to deliver several additional bombshells. The most significant of these was the disclosure that prosecutors pushed the case forward and secured a conviction relying on evidence that they knew or should have known was false, and that they failed to turn over potentially exculpatory evidence to defense counsel....