michael's favor was the fact that the prosecutor would have to try a very different much weaker case duane deaverd be inadmissible >> i think their case is very, very badly compromised because of deaver. he was all over the crime scene. >> reporter: and there was another important victory for peterson's side. >> what types of services did you perform? >> oh wow, that's -- that's pretty broad. >> reporter: brad, the male escort, a sensational centerpiece of the prosecution's case, wouldn't be part of a second trial either, a judge said the escort had been revealed in a search that was deemed illegal. >> the search warrant that resulted in the seizure of the computer was found to be invalid. >> reporter: furthermore, that dramatic trial within a trial about michael's long-dead friend in germany well, a change in north carolina state law regarding the admissibility of evidence meant a second jury might not hear that story either. expert blood testimony is gone you're left with the autopsy pictures >> reporter: yeah? >> the medical examiner's testimony. and maybe the prosecution's theory for motive.