dna exonerations in so many of these cases we actually find the p but most of them were eyitness misidentification. 75%. but a lot of them involved unreliable forensic science as a contributing factor. and there are two cases, two very important cases, ed, that have to be covered in the course of this political campaign. one is of course the case of cameron todd willingham that you have covered which deals with a man that governor perry executed based on unreliable arson evidence and now what is shown to be the perjurious testimony of the jailhouse snitch. everybody -- most disinterested legal observers believe that there's powerful evidence that willingham was innocent and executed. but what's even worse about it is governor perry has been engaged in a concerted campaign to cover up the fact that the arson evidence in that case was unreliable.