There was plenty of DNA evidence in that house linking Knox to the knife and scene and none of it was ever judged to have been cross contaminated by the Italian Courts. It was also shown by forensic experts that there were numerous people involved in the murder rather than just one individual.
It's not right to say there is
The Murder of Meredith Kercher
The Evidence - The Murder of Meredith Kercher
Knox initially confessed that she was in the house on the night of the murder and that she heard Miss Kercher scream, identifying a Congolese bar owner, Patrick Lumumba, as the assailant. She told the court during the trial that the confession was made under duress but then repeated the entire account in a five page memorandum the next morning. She later claimed Italian Authorities beat her, something which was strongly denied by everyone involved in the inquiry.
Lumumba was promptly arrested and spent two weeks in jail and Knox seemed quite happy for him to remain jail . It was only by chance that a Swiss businessman read about the case and came forward to say he had been talking to Lumumba in his bar on the night of the murder — offering him a rock-solid alibi. Lumumba has also always claimed Knox was the one behind the murder that night.
Knox then changed her story saying she was far away from the scene with her boyfriend at his place that night and that they watch the film Amelie on his lap top.
Sollecito could not back up Knox’s alibi on the night of the murder. Whilst she claimed she spent the evening with him, smoking marijuana, watching the French film Amelie and making love. Sollecito told police he could not remember if Knox was with him that evening or not.
Even assuming his memory was hazy because of the drugs, it seemed odd that a young man who had just embarked on a new relationship could not recall whether he had spent the night with his girlfriend or not.
Sollecito claimed he used his computer to download and watch cartoons and Amelie. But computer experts told the court that there was no activity on his laptop between 9.10pm on Nov 1, and 5.32am the next morning — the time frame in which the murder took place.
Knox and Sollecito turned off their mobile phones on the night of the murder, from around 8.40pm, and turned them back on at around 6am, inviting further suspicion.
A bedroom belonging to one of Miss Kercher’s Italian flatmates was ransacked on the night of the murder, with a window smashed with a rock. But police said the break-in was staged - broken glass from the window was found on top of clothes scattered on the floor, suggesting the window was broken after the contents of the room were messed up. Prosecutors accused Knox and her boyfriend of staging the break-in to make the killing look like a burglary that had turned into rape and murder.
Knox claimed that she slept in late the next morning but this was contradicted by a local shop keeper who clearly saw her very early next morning following Meredith's murder, when she came in to his shop allegedly to buy cleaning products such as bleach.
Why Amanda Knox's story just doesn't wash - BelfastTelegraph.co.uk
Evidence against Amanda Knox makes conviction seem likely
Shopkeeper Says He Saw Knox After Murder - ABC News
Then there is the The 3am call to her mother which she denied making, her table lamp locked in the murder room, the different accounts of the locked door, the witness who saw her and her boyfriend overlooking the cottage on the murder night and numerous other such evidence such as the fact Amanda Knox made two statements to Meredith's friends that the police found suspicious because they contained details that Amanda Knox should not have known. Indeed Meredith's roommate Natalie Hayward and other friends of Meredith's in Perugia at the time such as Amy Frost and Robyn Carmel Butterworth have always claimed they believe Knox to be the murderer.
Amanda Knox Knew Details of the Crime She Shouldn't Have Known - The Murder of Meredith Kercher
Local News | Roommate testifies in Amanda Knox murder trial | Seattle Times Newspaper
Why I believe Knox killed my friend
Whilst Rudy Guede was sentenced to 30 years in prison for his part in the murder, but has had his sentence cut to 16 years and who is eligible for parole later this year has always maintained that it was Knox who was in fact the murderer, and it will be interesting to hear his views once he is released and has nothing to lose.
There are people in US Prisons serving life for murder on far less evidence than Knox and Knox has proved her self to be nothing more than a blatant liar in the past, even accusing a man she knew to be innocent. So cold is Knox, that I honestly think she would have quite happily have seen Patrick Lumumba serve a life sentence for something she knew he hadn't done, and her behaviour throughout the case has been extremely questionable.
I am also not the only one to believe there is significant evidence, Professor Alan Dershowitz of Harvard University School of Law also thinks there is significant evidence, as does fellow US Law Professor Julian Ku, and both agree that Knox should be extradited.
There is also a new motive for the crime been uncovered which further implicates Amanda Knox, with the Italian Courts to due to release this information shortly.
'Evidence of a motive' for the crime behind Amanda Knox verdict - Europe - World - The Independent
Finally the people I feel sorry for in all of this are the forgotten victims, Meredith and her family who have lost a much loved daughter and sister, and who have sat through the trial and having listened to the evidence fully support Knox's extradition.
Amanda Knox Weeps And Vows To 'Fight Till End'