If there was blood and brain matter in the rental car, that's a slam dunk
But that's not exactly what the prosecution had. They still had some blood samples when they reopened the case, but the testing on them was for whatever reason inconclusive (the samples might have degraded over the years?)
As for the brain matter, the prosecution didn't have that. What they had was a photograph of a bit of tissue found inside the car, but that particular piece of tissue had been lost. The prosecution claimed that the photo itself showed that the tissue was brain matter.
FWIW, I think Carpenter did it. But I've also gotta say that I've seen that photograph and it doesn't look conclusive at all to me; as far as I can see the piece of gloop in the photo might have been a speck of brain, a booger, a bit of half-chewed ham, etc. Of course, I'm no physician or medical examiner.
EDIT -- I just watched a documentary on the Bob Crane murder, to refresh my memory. The prosecution's case was poorer than I remembered. One of the investigators had taken the photo and without any accompanying explanation, showed it to five different pathologists and asked, "what can you tell me about this." All five identified the tissue speck not as brain matter but as subcutaneous (just beneath the skin) tissue, and one noted that a hair was visible as well. So I guess the photo was pretty conclusive to people who knew what to look for, but it wasn't brain at all, it was a tiny piece of scalp.
Furthermore, the photo was all the prosecution had on that score. The original tissue sample had been lost. But even worse, the prosecution could not produce the person who had taken the photo, or for that matter anyone at all who had personally seen the tissue speck with his or her own eyes. All they had was a photo which some unknown person had taken, at some unknown time during the initial investigation, of a tissue speck that no known person had seen directly. Not great stuff for a conviction.
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