Witness reliability plays prominently in Troy Davis' internationally-watched case. In the two decades since Davis was condemned for fatally shooting Savannah police officer Mark MacPhail, seven of the nine witnesses who testified against Davis at his trial have recanted their testimony. No jury has heard those recantations, and a Savannah judged looked upon evidence of changed testimony with suspicion.
A Chatham County judge signed a death warrant Tuesday for Troy Anthony Davis. Convicted of killing a Savannah police officer in 1989, this is Davis' fourth death warrant. But he's avoided execution because of questions about his guilt. Experts say, the case highlights problems in the judicial system.