issues with the evidence that was tested, said the defense. that cellphone, for instance, the one the prosecution went to great lengths to say clay used after killing chanin -- >> they swabbed the face of the cellphone and they got dna. and they got this dna and it's not his. unidentified male. the phone doesn't have mr. starbuck's dna on it. >> reporter: and more unidentified dna found on chanin's neck, where she was strangled. >> fair to say going back to the term match, that there was another contributor on the sample referenced miss starbuck's neck male contributor that has not been identified? >> correct. >> reporter: whose dna was that, the defense asked? no one knows. but the presence of male starbuck dna at the crime scene was no mystery at all. not only had clay lived in that house but the dna could have