Knox DNA evidence 'tainted'
Source: Agencies |
July 26, 2011, Tuesday
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THE investigators who collected the genetic evidence used to convict American student Amanda Knox of murder in Italy made a series of glaring errors, including using a dirty glove and not wearing caps, two independent forensic experts said yesterday.
The experts had been appointed by an Italian appeals court to review the DNA evidence used in Knox's trial, including some found on a kitchen knife believed to be the murder weapon and some found on the clasp of the victim's bra.
That evidence played a crucial role in securing the convictions of Knox and her co-defendant Raffaele Sollecito in the 2007 murder of Meredith Kercher, a Briton who shared an apartment with Knox while they were both exchange students in the city of Perugia.
Knox, 24, and Sollecito, 27, have denied wrongdoing and have appealed. The evidence review was granted at the request of their defense teams.
In the first trial, prosecutors maintained that Knox's DNA was found on the handle of the kitchen knife and Kercher's DNA was found on the blade. They say Sollecito's DNA was found on the clasp of Kercher's bra.
But the independent experts, both from La Sapienza University in Rome, told the appeals court that the collection of evidence fell below international standards and may have resulted in contamination. They used slides to refer to international protocols for the collection and sampling of evidence.
Contamination risk
One of the two experts, Stefano Conti, cited several cases of forensic police entering the crime scene or coming into contacts with objects there not wearing protective equipment such as masks or hair caps. He said that while evidence should be wrapped in paper or kept in a paper bags, police often used plastic bags, heightening the risk of contamination.
"There are various circumstances that do not adhere to protocols and procedures," the forensic expert said.
In footage and frame grabs shown to the court, two police officers collected the bra clasp, and the glove worn by one of the two appeared to be dirty on two fingers. Conti noted the bra clasp was collected 46 days after the November 1, 2007 fatal stabbing of the 21-year-old Kercher.
"Over those 46 days several objects were moved, and at the same time several people will have come in and out," he noted, again stressing the risk of contamination.
The other expert, Carla Vecchiotti, explained to the court that the genetic profile on the knife's blade that was attributed to Kercher is dubious and cannot be attributed with certainty. She said the original testing did not follow recommendations of the international scientific community for dealing with DNA testing.
Vecchiotti said the review concurred with the original testing in saying that the genetic profile on the knife's black plastic handle could be attributed to Knox. The knife was found at Sollecito's apartment.
The experts had been appointed by an Italian appeals court to review the DNA evidence used in Knox's trial, including some found on a kitchen knife believed to be the murder weapon and some found on the clasp of the victim's bra.
That evidence played a crucial role in securing the convictions of Knox and her co-defendant Raffaele Sollecito in the 2007 murder of Meredith Kercher, a Briton who shared an apartment with Knox while they were both exchange students in the city of Perugia.
Knox, 24, and Sollecito, 27, have denied wrongdoing and have appealed. The evidence review was granted at the request of their defense teams.
In the first trial, prosecutors maintained that Knox's DNA was found on the handle of the kitchen knife and Kercher's DNA was found on the blade. They say Sollecito's DNA was found on the clasp of Kercher's bra.
But the independent experts, both from La Sapienza University in Rome, told the appeals court that the collection of evidence fell below international standards and may have resulted in contamination. They used slides to refer to international protocols for the collection and sampling of evidence.
Contamination risk
One of the two experts, Stefano Conti, cited several cases of forensic police entering the crime scene or coming into contacts with objects there not wearing protective equipment such as masks or hair caps. He said that while evidence should be wrapped in paper or kept in a paper bags, police often used plastic bags, heightening the risk of contamination.
"There are various circumstances that do not adhere to protocols and procedures," the forensic expert said.
In footage and frame grabs shown to the court, two police officers collected the bra clasp, and the glove worn by one of the two appeared to be dirty on two fingers. Conti noted the bra clasp was collected 46 days after the November 1, 2007 fatal stabbing of the 21-year-old Kercher.
"Over those 46 days several objects were moved, and at the same time several people will have come in and out," he noted, again stressing the risk of contamination.
The other expert, Carla Vecchiotti, explained to the court that the genetic profile on the knife's blade that was attributed to Kercher is dubious and cannot be attributed with certainty. She said the original testing did not follow recommendations of the international scientific community for dealing with DNA testing.
Vecchiotti said the review concurred with the original testing in saying that the genetic profile on the knife's black plastic handle could be attributed to Knox. The knife was found at Sollecito's apartment.
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