I was reading this before dashing off to work this morning which ties in with what prh says above....directly taken from an interview with the judge who found them innocent at the 2nd trial.
"Wasn't the DNA of the accused on the weapon and on Meredith's underwear a proof (of their guilt)?" (journalist's question)
"No, and I'll explain why. The first grade judge decided it wasn't necessary to have an expert witness look at it (the knife) The forensic service's findings were enough for him. For the prosecutor that was enough to cement the accusations, but when the defence team of the accused, at the second trial, highlighted their issues about the incongruencies found in that examination (of the forensic service) we decided to have an impartial expert witness look at it. The experts, in our opinion, the best we could get, completing demolished the biological proof"
"Wasn;t there any DNA from the accused?"
Yes, but the traces on the blade of the knife were so tiny that the genetic map of the DNA signalling to whom they could be ascribed was too broad a spectrum. Those traces, apart from to Knox and Sollecito, could also be traced back to me, what I'm saying is, they could even show a level of compatibility with the president of the court"
(I actually started reading this interview because it struck me as a bit
that everyone (including the Italian council of judges) is humphing about the latest judge giving a very brief non-committal interview to the press, whereas the 2nd level judge gave a much more informative and less objective one.
When asked
"Are Knox and Sollecito innocent"
He replied
"That's not the point". (Going on to say that legal procedure had been followed and could not, beyond all reasonable doubt, say that they were guilty, ergo, they had been absolved)
When asked about the famous bra strap he confirmed there was RS on it, and 3 other men. Presumed to be the police/scientists who were seen on video picking it up and putting it down etc.