This was actually a great discussion point in the Marsaca report. Marasca used this principle to discuss the DNA in the LCN context, where a partial profile is generated. Marasca stated, IIUC, that if a DNA profile only provides a partial profile, it lacks sufficient specificity to form a the basis of an acceptable fact in court. (But DNA tests are only partial tests anyway, right?).
I'm not sure Marasca "solved" the conundrum of how to deal with trace DNA at a crime scene, but I thought the discussion was a noble effort anyway.
Also interesting, was Marasca set Chieffi straight on this point. That in order to have confidence in a DNA result, it was the prosecution's burden to insure the DNA lab result was reliable. In cases of LCN, that required at least two if not 3 repeats. Since Stefanoni only had one non-repeatable event for both the bra and knife clasp, those results had to be rejected as evidence.
Marasca also dealt with the issue of importing results from Guede's trial, into the case against Amanda and Raf. This was hard to follow, but the sense I got was neither the findings from Guede's trial, nor the testimony of Guede, could be used against Amanda and Raf, since they didn't have a chance to fight it in the original setting. It was a weird position I thought, and I may not have understood it correctly. It seemed like the courts were free to establish these "facts", but the "facts" could not be used against other defendants in future cases. (Which btw, mirrors the principle of collateral estoppel in US courts).
Also, Marasca reasoned that Nencini was irrational for not suspecting Filomena and Laura, as much as Raffaele, since they also didn't know Rudy nor had ever met him, just like Raf. An unexpected flourish of rationality!
One of the most interesting points Marasca made, was that in a case with only circumstantial evidence such as this one, a motive is critical, and without which a guilty verdict cannot be sustained. Motive is what ties circumstantial evidence together into a coherent picture. Without a solid credible motive, a conviction based on circumstantial evidence is precluded by law. (But crazy people think differently, so I don't know what to make of it, but there is a hint of sense in this thinking, no?)
Marasca listed all the issues on appeal at the outset of the opinion, and went through the issues methodically. I thought the discussion was really closely carefully reasoned. There were some unfortunate things, like saying there were multiple attackers - with no apparent evidence of any kind other than a previous judicial finding. And that as far as I can tell, the break-in was staged. (So Hellman said the break-in was real, and AK/RS not guilty because the crime did not occur. Marasca I think says the break-in was staged, but there is zero evidence it was staged by Amanda and Raf, so they are just not guilty of a crime that did occur, if I have it right).
I guess we desperately need a solid translation to really understand it. But I thought Marasca took on a lot of the logically flawed methods used by the lower courts, and did some heavy lifting in terms of getting Italy to resemble a modern judicial system again. On balance, I have to say I'm impressed with Marasca.
Oh, and referring to Dr Gill, as an expert in the field, who has written specifically on the failures in this case, is well within the traditions of courts citing expert scholarship to support their opinions. Happens all the time in the US.