I think people need to start to realise that people with any level of lowered comprehension, intelligence or mental faculties can be coerced into false confessions. And that's especially true of younger people who are still (unless they are already repeat offenders with extensive experience with authority figures in law and order) in a psychological position of deference to people such as police officers and judicial figures.
Everyone should carefully look at this example:
http://abcnews.go.com/Primetime/LegalCenter/story?id=1779251&page=1
I've mentioned this case before (I linked to the actual video of the interrogation before, but it will be fairly easy to find probably). The subject - Roberto Rocha - was coerced into making a false confession. The methods used by the police were stunningly similar to those used on Knox: "we know what happened and we already have the evidence to prove it"; repeated interruptions and negations of the suspect's denials; "tell us the truth or you'll be in huge trouble"; high levels of aggression, anger and intimidation from the interrogators; instructions from the interrogators that things would go well for the suspect if he "told the truth"; consistent leading and coaching of the suspect by interrogators in respect of details of the crime (once the false confession begins). And eventually Rocha "buckled and told them what they already knew to be the truth" (copyright: Perugia police chief Arturo de Felice).
The other stunning similarity comes from the extreme difficulty Rocha (and his lawyer and family) had in convincing the authorities that he had actually been in Brazil on the day of the murder (which was committed in Georgia, USA). As the article linked above points out:
The Rev. Joao Rocha, Roberto's father, provided all kinds of documentation to prove that: stamped passports, plane tickets, pictures, witnesses from the trip and even an X-ray of Roberto's mouth from a visit to a Brazilian dentist on July 2, 2002 -- the day of the murder.
"It was the best alibi that I could ever imagine a person having," Steel said.
But once Rocha confessed, police were slow to accept any other explanation. Hunton said that the proof Rocha was out of the country was "equivocal."
It took a great deal of time and effort - and the belated realisation by the senior investigating officer that there were glaring contradictions, errors and improprieties in the videotape* of the interrogation - for police to drop the charges. Rocha apparently had a low mental age. Knox had been suffering significant sleep depravation at the time of her infamous 5th/6th November interrogation. Both are listed in the researched linked below as proven, tested factors underpinning false confessions:
http://www.psychologyandlaw.com/False Confession Research .htm
The matter of the blinkered refusal of the authorities to accept any evidence which disproves a "confession" of course chimes very strongly with issues in the Knox/Sollecito trial. The time of death (which could reasonably be narrowed down by factors such as the stomach contents analysis and the cellphone activity) simply did not fit with Knox or Sollecito being participants. So what did the police and prosecutors do? They just moved back the ToD arbitrarily to a later time which didn't absolve Knox/Sollecito - because they "knew" Knox and Sollecito had been involved and because Knox had "confessed". Likewise, the Kitchen knife from Sollecito's drawer showed a controversial and utterly scientifically-unsound (and more-or-less impossible in context) positive test for Kercher's DNA, and of course that fit nicely with Knox and Sollecito as participants (which the police and PM "knew", and which was supported by Knox's "confession"). But there was the bloody imprint at the crime scene of a totally different knife with an entirely different blade length and width - a knife which was wholly compatible with all the wounds inflicted upon Kercher, and a knife which logic clearly suggested had made ALL those wounds. But the police "knew" Knox and Sollecito had been involved - Sollecito's kitchen knife was handy evidence to support this "truth". Thus they invented the ludicrous scenario of multiple knives being held at Kercher's throat, then plunged into her throat, more-or-less simultaneously while she was being restrained. And so on......
And, lest we forget, the same blinkered refusal to accept evidence disproving a "confession" was on show in respect of Lumumba in this case too: a Swiss university professor found out about Lumumba's arrest from a friend in Italy (Knox's "confession" revolved around her meeting Lumumba on the night of the murder, and taking him to the cottage whereupon he had assaulted and killed Kercher), but he knew (with proof of dates and timings) that he had been talking with Lumumba throughout the time period when the murder could have occurred. The professor flew to Perugia on his own initiative (apparently having been given the cold shoulder when he telephoned the Perugia police), and gave a statement which clearly showed that Lumumba had a watertight alibi and could not therefore have been involved in the murder. But the police and PM already "knew the truth", and Lumumba's involvement was part of that "truth". And of course Knox had "confessed" to exactly that effect. And thus the police and PM initially refused to believe the professor's version of events - accusing him of either being mistaken or lying. It was only when unimpeachable timings records were produced and others came forward to support the professor's account that he was believed. Of course, by that time Guede was firmly in the frame, so it was wholly convenient for the police and PM to concoct the fable that their arrest of Lumumba was entirely down to deliberate and wilful lying and misdirection from Knox, and that their "truth" was still correct and intact - just with a substitution of Guede for Lumumba.
* And Rocha (and we, the wider public) is fortunate indeed that the video of his interrogation was part of the investigative material and was subsequently made public. I also suspect that its very existence - and its viewing by others in the wider criminal justice community - might very well have prompted the chief investigating officer to belatedly "discover" the gross improprieties within the interrogation. Had the video either never been made or never left the police station, the outcome might have been very, very different. Viz the interrogations of Amanda Knox and Raffaele Sollecito on the night of 5th/6th November 2007 in the (new, hi-tech and fully equipped for recording) Perugia police HQ.............................