so even of the pool of suspects that the defense argued could have committed this crime, none of them were sterile. >> maybe none of them committed the crime. >> well, there's always, i suppose, that possibility. and again, if you take just that single piece of evidence you can create whatever doubt you wish to create. >> the defense was focused on presenting hard, physical evidence to show the jury that gabriel ferris could not be the killer. what it said were hairs and semen that didn't come from ferris, and the defense argued that the state had a shaky case based on two old fingerprints, circumstantial evidence, and witnesses whose stories had changed over three decades. >> all right. you may proceed. >> the defense argued the case never would have gone to trial if it had not been for one man. >> that's what you say he told you. >> that's what he told me. >> roy walton, the retired saginaw police detective that