the reason why it kept me in prison so long is because the jury believed that that was the victim s blood on my truck. you know, the prosecutor argued that vehemently to the jury. the jury bought it. the jury convicted me. reporter: greg s legal team brought the new evidence before the judges. i m sitting there in the courtroom and the three-judge panel and listening to this testimony. you know, and still wondering, okay, well, how are they going to get it wrong now? reporter: in a dramatic moment, greg s lawyer asked the sbi agent responsible for the tests to clarify his bench notes. i can t say with scientific certainty that that was blood. reporter: but that conclusion was never presented at greg s original murder trial. so anyone reading your formal report would not have known that you had not scientifically confirmed that was blood? that s correct.