Let me put it this way:
I think it is unlikely that the DNA got there during the course of the murder.
I think it is unlikely that the DNA got there through an innocent transfer prior to the murder.
I think it is unlikely that the DNA got there through contamination during the recovery and storage process.
I think it is unlikely that the DNA got there through contamination during the testing process.
I think it is unlikely that an error was made during the testing or analysis process and the DNA that was tested didn't have the alleles found to be there.
I think it is unlikely that the DNA test results were accurate but the DNA was not Sollecito's
I think it is unlikely that Stefanoni intentionally falsified her results.
If I made estimates for all the possibilities listed above and added them up the sum would be less than one. Yet the sum must be one unless there is some possibility that I haven't considered. Something appears to be wrong with my ideas about this but I'm not sure what it is.
ETA: I thought I'd order the list from most likely to least likely. Of course, since the probability estimates are based on my admittedly not well informed view of all this it isn't worth much.
DNA got there through contamination during the testing process.
DNA got there through contamination during the recovery and storage process.
Error was made during the testing or analysis process and the DNA that was tested didn't have the alleles found to be there.
Stefanoni intentionally falsified her results.
DNA got there through an innocent transfer prior to the murder.
DNA test results were accurate but the DNA was not Sollecito's
DNA got there during the course of the murder.
OK I can agree with most of your points here...except that
Lets take out RS and just deal with the other three men found on the bra clasp first OK? Lets do that and then we will come back to RS and if he is or is not found there.
So does that change anything about your ideas or the likelihood of the order of logical explainations?
What gives you the confidence about Stefanoni? Perhaps since no one has made a case or done much of an investigation of her besides C and V it may seem like she is competent but perhaps unlucky. Is that what you think?
Because I think there are a series of facts revealed over the years and mostly from statements Stefanoni made in or acted out in open court that indicate certainly incompetence but more likely corruption. I think she was forced to act on the orders of her boss Biondo but that hardly forgives that huge number of irregular and suspicious lab activities from her own hand and mouth that points to guilt of corrupt activity beyond a reasonable doubt. Why even the reason for the return to the crime scene on Dec 18th is never explained nor does the dopy defense seem to probe this seeming unusual and unnecessary return. Not that I recall anyway.
Stefanoni lies in court about quantification in the detention hearing. If she had told the truth that that sample 36b was tested for blood and found to be negative, tested as something not human, and was of a size too small to test then could that be important especially in the case against Knox?
At that point they contended they had RS dead nuts because of his shoe prints...they had nothing on Knox at all...unless you wish to consider something even the ISC refused to allow into court because it was illegally obtained. The non confession confession.
Stefanoni lies during the trial when she infers the luminol samples are from blood and yet fails to mention that the TMB testing was preformed and all tests showed a negative result. A real scientist does not play games with the facts like this...if she truly thought these prints were still from blood but only diluted then she is qualified and understands certainly all (there are many) the easy and available tests to confirm blood. This is not new science...it is simple and able to be proved to the highest degree of certainty. But she not only does not confirm but she even failed to reveal the truth about TMB testing. Sara Gino had to pick that out of the data. This is not the way honest scientists do things.
Nor do honest courts and prosecutors ignore the dangers of using severally conflict of interested consultants like Biondo who sat beside Mignini for most of the trial. This strikes me as especially odd. As a reminder Biondo is the manager of the lab that Stefanoni works for. And...
During the first trial the defense asked for a DNA review and received one...yes indeed Mr Biondo himself confirmed that Stefanoni's work was sound and up to standards and therefore safe. And Massei not only accepted that conclusion without batting an eye but then refused further requests for a more independent review. This alone is enough to prove that Italian courts and the police scientific labs are unsafe for making any conclusions except proof that someone needs some brush up on how to lie without coming off as complete idiots courses.
We could talk about Stefanonis refusal to turn over data asked for by the independent experts and required the judge to twice email her and order her to comply and it remains unclear if she ever fully complied. What is clear is that whatever the IE got, that they only received it a day before they were due to report their conclusions to the court...instead they had to go in front of the court and ask for a extension since they just got the data...or most of what they needed anyway. Later the IE were both thanked by a visit each from two car loads of Perugia goon squad...errr police officers...what could that be all about? That story is also found somewhere on Perugia Shock IIRC ( btw Did Randy get eaten by a shark)
A real court would have tossed Stefanoni and Comodi into jail for failing to comply, and twice attempting to introduce false or incorrect control data information into the case file. Who gets caught doing that and gets away with it? Fake documents found in the days case files and nothing??? Well questions and a break to find the real documents but when they failed guess what???They simply tried again later to introduce faked documents...faked? Harsh perhaps...incorrectly dated data with numbers that matched nothing and could not have come out of the machines which should produce such information easily and unaltered. That would be inside the EDF's that no one needs to see except for Stefanoni apparenty.
If the Italian Justice system allows itself to be ignored, lied to and tricked and after catching the actors red handed they then fail to take action to stop the mockery of the court then the court must be deemed a laughable joke only. Who can take anything they do seriously?
If you wish to take one small irregularity and give it a possible innocent mistake judgement call then fine...but the whole of the circumstantial evidence against the police and prosecutor seems undeniable. The decision in March of the ISC indicates something other than rational due process going on there.
I think Stefanoni looked at that result from the bra clasp and saw RS there because she was ordered to do that. How can we explain the other three men she ignored on there? She didn't find those guys BTW...the IE found those other guys. Hummmmmmmm not too tough actually.