Vercingetorix
Fluidmaster
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Look, here's an article on a blog written by a bunch of law professors, explaining that the amount of Meredith DNA on the knife and Sollecito DNA on the bra clasp was so low that neither could have resulted from a direct transfer.
What Really Happened in the Amanda Knox Case? | Wrongful Convictions Blog
In the Amanda Knox case, in order to determine Merediths DNA on the knife blade, it was necessary for the DNA analysts to go down to an RFU level of 15 one tenth of the cutoff of the most inclusive DNA analysis. This could not have resulted from a primary transfer; that is, the knife blade could not have been in direct contact with Meredith, much less her blood. The Italian authorities had claimed that the knife had been carefully cleaned, but well come to that later.
The data was similar for Raffaeles DNA on the bra clasp, meaning that Raffaele could not have directly touched it.
So how did Merediths DNA get on the knife blade, and Amandas on the knife handle, and Rafaelles on the bra clasp? With the DNA levels detected, it had to be secondary or tertiary transfer.
a) Meredith and Amanda were roommates and friends. Amanda certainly had Merediths primary and secondary DNA on her. All she had to do was to be cooking in Raffaeles apartment kitchen, and she would have left her own DNA on the knife handle, and could certainly have left Merediths DNA on the blade.
b) Raffaele and Amanda were dating, and consequently, he knew Meredith, and had contact with her. All he had to do was to shake hands with Meredith, and she would have his primary DNA on her, and she would transfer his secondary DNA to her bra clasp.
c) A combination of two things. To begin with, Amanda and Raffaele were allowed back into the apartment after the initial evidence collection not a good idea. While viewing video of the Italian evidence technicians collecting the evidence, Prof. Hampikian noticed that they were not changing their gloves between handling different pieces of evidence. This creates a situation for secondary or tertiary transfer both in the initial evidence collection procedure and subsequent to Amanda and Raffaele being allowed back into the apartment.
Recall that the Italian authorities had claimed that the knife had been carefully cleaned. When the appeals-court-appointed Italian DNA experts examined the knife microscopically, they found that it was coated with potato starch. So much for careful cleaning.
Prof. Hampikian advised Amandas legal team about the DNA issues. The Italian court appointed two independent, Italian DNA experts to review the evidence, and their conclusion was that the DNA evidence presented at trial was not scientifically supportable, and consequently not valid.
What Really Happened in the Amanda Knox Case? | Wrongful Convictions Blog