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Knox DNA expert defends evidence

The forensic expert whose evidence helped convict Amanda Knox of murdering British student Meredith Kercher has defended her work after a review criticised her methods.

Patrizia Stefanoni spoke at Knox's appeal trial which resumed after a summer recess. A verdict is expected by the end of the month.

American Knox and her co-defendant and former boyfriend, Raffaele Sollecito, were convicted of sexually assaulting and killing Meredith Kercher in the Perugia apartment that Knox and 21-year-old Miss Kercher, from Coulsdon, Surrey shared while studying in Italy. Knox was sentenced to 26 years in prison; Sollecito to 25.

An independent review of DNA traces in the case found that much of the evidence collected in the original investigation fell below international standards and may have led to contamination of the samples.

They especially focused on some traces of DNA linking the defendants to the crime, and concluded that due to the risk of contamination and the low amounts of DNA used for the testing it was impossible to extract a genetic profile with any certainty.

Prosecutors had said that Knox's DNA was found on a knife handle and Miss Kercher's DNA was found on the blade. They also say Sollecito's DNA was found on the clasp of Miss Kercher's bra.

Independent expert Carla Vecchiotti told the hearing that data was so mixed that a very high number of genetic profiles could be extracted, depending how one combined the data.

The findings have boosted the defendants' efforts to be cleared and gain freedom after almost four years in prison.

But Ms Stefanoni, the forensic police officer, countered some of the points, saying that DNA analyses were carried out from behind a glass wall to avoid the risk of contamination. She also said some of the standard protocols cited by the experts were published after she finished her report in May 2008.

Just before the trial resumed, Miss Kercher's sister Stephanie issued a letter asking the appeals court to assess "every single (piece) of evidence" so justice can be done. The Kercher family insisted they still had faith in the Perugia police, investigators and the court, but also expressed worry over the evidence review.

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