Vulnerabilities identified as high risk for false confession:
1) eagerness to please the investigating officers
2) firm trust in the police and great respect for them
Evidence for 1 & 2:
"I understand that the police are under a lot of stress, so I understand the treatment I received." (Amanda Knox, handwritten note of 6th November)
"I have been told there is hard evidence saying that I was at the place of the murder of my friend when it happened. This, I want to confirm, is something that to me, if asked a few days ago, would be impossible." (Amanda Knox, handwritten note of 6th November)
"I'm doing the best I can, just like you are." (Amanda Knox, handwritten note of 6th November)
3) lack of confidence in his memory of events
This was undermined before and during the interrogation by both the interpreter and the police:
'what made me try to imagine something was someone saying to me "Maybe you're confused, maybe you're confused and you should try to remember something different. Try to find these memories that obviously you have somehow lost. You have to try to remember them. So I was there thinking, but what could I have forgotten? And I was thinking, what have I forgotten? what have I forgotten? and they were shouting "Come on, come on, come on, remember, remember, remember," (Amanda Knox, trial testimony, June 2009)
http://boards.insessiontrials.com/showthread.php?356199-Amanda-Knox-Testimony
4) high suggestibility
Not sure whether this is true of Amanda, or what would consist of evidence for this.
5) the individual's role changes from that of a witness in an informal interview to that of a suspect.
Asked whether "the fact that you were being called every day to the Questura, didn't that worry you and your family?"
"I really never, never thought that they suspected me. Never." (Amanda Knox, trial testimony)