Lawyer Says Amanda Knox Prosecutor Switched Motives

Knox's lawyer also reminded the court how on that same day Amanda was taken back to the scene of the crime, along with her housemates, and shown the knives in the house. They were asked whether the knives were part of the household cutlery. At the sight of the knives, Amanda collapsed, witnesses said during the trial, and had to lie down.

Dalla Vedova challenged some of the evidence presented by prosecutors, particularly the claim that a knife found in the kitchen of Knox's co-defendant and former boyfriend Raffaele Sollecito had a speck of Kercher's DNA on the blade and Knox's DNA on the handle. Prosecutors claim the knife is the murder weapon.

During the trial, Knox's lawyer presented forensic experts who argued that the blade of the knife was not compatible with the cuts on Kercher's neck, and there was too little DNA to carry out a second test to confirm the DNA.

"The compatibility of the knife... how can you evaluate the evidence of the knife?" Dalla Vedova asked. "It is not strong enough to be proof."

Noting that Kercher's DNA on the knife did not include blood, he demanded, "How can you use it as a murder weapon and not find blood on it?"

He also warned the jury to not be influenced by the widepsread coverage of the murder and subsequent trial in the Italian press.

Knox, he said, "has been the object of a trial through the media, of slander, of violation of privacy... You have to keep in mind the great influence of the press on this trial."

During a break in the day's proceedings, Knox's father Curt Knox told ABC News that he was pleased with the summation.

"I think it's going well. Carlo is trying to emphasize to the jury they need to separate the public media trial from the trial in the courtroom. Look at the facts and what is heard in the courtroom, not outside," Curt Knox said.

"Amanda is as confident in her attorneys as we are. We look forward to seeing a positive result," he said.

The knife as evidence also came under attack outside the courtroom today. Elizabeth Johnson, a forensic biology and DNA expert, has co-authored a petition stating that the knife proves nothing.

Johnson told "Good Morning America" today, "The handle of the knife is expected to have some of Amanda's DNA on it since she used those kitchen knives to prepare food in Raffaele's apartment."

Amanda Knox Evidence Disputed

She dismissed the DNA on the blade saying, "It's an amount of DNA that would come from 20 or fewer cells.... The key part of this is there was no blood detected by chemical test methods."

"That test, when the handle and the knife blade were tested with chemical tests, were negative when tested for blood," said Johnson, who has not examined the evidence.

She also criticized the DNA tests on Kercher's bra clasp that was torn loose during her murder and not recovered by police until weeks after they searched the house. Sollecito's DNA was found on the clasp, which prosecutors argue puts him at the scene of the murder.

"That bra clasp was found and collected 47 days after the murder. And it had been moved from its original location where it was documented on the crime scene video," Johnson said.

"These DNA results could have been obtained even if no crime had occurred," Johnson said, saying the DNA could have transferred in the bathroom or in laundry.

Johnson said there was "absolutely not" enough evidence to link Knox to the crime.

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