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With everything the coroner had to say. >> dr. barnett's opinion was that these fractures that you see in this photo were caused by three different impacts. do you agree with that opinion? >> no. >> what conclusion can you draw about how these fractures and these injuries were used >> one impact on a very hard, flat surface. that's my opinion. >> reporter: dr. spitz said the science showed russell adkins had been telling the truth. dana had hit her head on the road after falling out of a car. and the original autopsy, which identified three small abrasions on her elbows and shoulder, proved th...

And immediately dropped her to the ground and as she's laying on the ground, struck her at least two more times. and fractured her skull. >> reporter: and the prosecution had a possible murder weapon they wanted the jury to hear about. they called a former patrol officer to the stand. two days after dana's body was found, he'd stumbled on something a few feet from the place where adkins said he'd turned his car around. >> i found the back side, the back end, whatever, of a pool cue and it appeared to have a substance on it that i thought possibly could have been blood. >> reporter: could a poo...

>> what conclusion can you draw about how these fractures and these injuries were caused? >> one impact on a very hard, flat surface. that's my opinion. >> reporter: dr. spitz said the science showed russell adkins had been telling the truth. dana had hit her head on the road after falling out of a car. and the original autopsy, which identified three small abrasions on her elbows and shoulder, proved that. >> the abrasions were significant to him, that abrasions to the elbows and the shoulder are indicative of a fall. when you fall back, your arms tend to go back to brace yourself from the fa...

Questioned the detective's account of checking out adkins' car door. >> is there anywhere in that report where you state, "i went out to the car, i inspected the car, i sat in the car, i opened door?" is that anywhere in report? >> no, it's not. >> reporter: just as questionable, said the defense, was the prosecution's possible murder weapon, that now long lost pool cue. they argued there was nothing linking it to any crime. >> you sent them off to have them test the material that was found on the stick, and you became aware it was not blood, negative for blood? >> negative for blood. >> negat...

>> reporter: a point he emphasized in his opening argument at russell adkins' trial. >> law enforcement lost or destroyed several pieces of evidence. >> reporter: neil mcelroy and his partner, ronnie wingate, drilled into the prosecution witnesses, challenging their 30-year-old memories. >> but you didn't remember where it was found? >> no, i couldn't tell you the exact spot. >> i don't remember. i mean it was 30-some years ago. >> reporter: as for the original detective, bob bratton? the defense got him to concede just how much evidence was missing. >> as it relates to the clothes, the pool c...