“If DNA, Then Guilty: Strategies for Overcoming Juror Assumptions About DNA Evidence In Criminal Trials” By Christina T. Kline, Demosthenes Lorandos, and Michael Spence, The Champion, January/February 2015.
This article goes through a possible sexual assault case, one that shows how important diligence by the defense is.
This is essentially the suspect-centric decisions both Massei's court and Nencini's court adopted.
Massei was completely uninterested in going at all beyond, "Raffaele found, Raffaele guilty," on the bra-clasp. Even though Massei tantalizingly makes reference to 165B being composed of "minor contributors" (plural), he rejects any investigation into their identities because he simply takes Stefanoni's word for it on two issues:
1) there was no contamination
2) this was not a suspect-centric investigation
So, he saw no need to appoint an independent verification of Stefanoni's claims. It's not proper to say, "Stefanoni's results", because without the EDFs it is not possible, really, to talk about anything other than Stefanoni's claims.
Massei took the further view that he could see no reason for Stefanoni to lie to the court. (As Machiavelli says: Stefanoni is not the one on trial here! So, apparently, she doesn't even need to bring her credentials to court!)
Judge Hellmann, in his now annuled decision, DID appoint an independent expert to analyse Stefanoni's work. Amongst other things, C&V report back to the court that Stefanoni either through ignorance or ill-will purposely masked that there were peaks above 50 RFU, which perhaps should have been counted as alleles, not stutter.
The real issue is that Stefanoni did not even report the implications of this to the Massei court, so Hellmann saw that as reason to reopen the contamination issue with regard to 165B.
But the ISC in March 2013 and the Nencini court turned the clock back. Nencini takes the peculiar view that regardless of any-claimed reality of extra "minor contributors" to 165B, the real issue is the suspect-centric one - "Raffaele found, Raffaele guilty".
Kline, Lorandos and Spence above would more than likely cringe, at least that's a fair assumption.
But one thing is for sure, the suspect-centric view is bound to return the verdict one was looking for to begin with.
At base, ISC in 2013 and Nencini in 2014 returned to the reasoning - if Stefanoni said she was not suspect-centric and that there was no contamination, that's good enough for us.