the blood pattern expert who put michael peterson in the staircase bludgeoning his wife, reporter julia sims to the jurors here in this case, julia. how important was the blood expert, deaver's testimony? >> that blood evidence was critical. here's a guy who has been doing this for years for the state. look at what his experiment showed. it's got to be the truth. >> he'd been key in other cases, too. the newspaper recounted the story of a man who was sent to prison for murder after deaver's lab report suggested a stain on the man's car was the victim's blood. >> and it turned out not to be blood. >> wasn't blood at all. >> huh-uh, no. >> and deaver knew, and didn't disclose it? >> deaver knew that that was not blood and didn't disclose it. >> that man's conviction was overturned. >> gregory f. taylor is innocent of the charge of first-degree murder. >> and there was more evidence of questionable conduct linked to deaver. the newspaper investigation suggested that the methodology behind some of the blood pattern experiments he was involved in was flawed, designed to produce pro-prosecution re

the blood pattern expert who put michael peterson in the staircase bludgeoning his wife, reporter julia simsrtant was the blood expert, deaver's testimony? >> that blood evidence was critical. here's a guy who has boon -- been doing this for years for the state. look at what his experiment showed. it's got to be the truth. >> reporter: he'd been key in other cases, too. the newspaper recounted the story of a man who was sent to prison for murder after deaver's lab report suggested a stain on the man's car was the victim's blood. >> and it turned out not to be blood. >> wasn't blood at all. >> huh-uh, no. >> and deaver knew, and didn't disclose it? >> deaver knew that that was not blood and didn't disclose it. >> reporter: that man's conviction was overturned. >> gregory f. taylor is innocent of the charge of first-degree murder. >> reporter: and there was more evidence of questionable conduct linked to deaver. the newspaper investigation suggested that the methodology behind some of the blood pattern experiments he was involved in was flawed, designed to produce pro-prosecution results. like