amy: bryan stevenson, the state's evidence of the match discredited by three highly qualified firearms examiners coming reading the former chief of the fbi's firearm in two marks unit, who testified in 2002, that the bullets from all three crimes could not be matched to a single gun at all much less to anthony's mother's gun. 2002, when you talk about they just would not reviewed, aren't there laws that say you have to review exonerating evidence? the supreme court unanimously overturned the verdict. brian: you are absolutely right. no, there aren't those kinds of laws. we rely on the integrity of prosecutors and the integrity of law enforcement officials to do what is required. and in this case, there was an absence of integrity. there was an absence of leadership. there was an absence of goodwill. that's the challenge that we face right now. mr. hinton is the 152nd person to be exonerated after being sentenced to death. that means for every nine people executed in this country, we now identified one innocent person. and if we had integrity, we would -- we would stop executed people u