general knowledge of (often abysmal) interrogation techniques used by police all over the world,QUOTE]
I'd just like to add that I think this is an important point.
The fact is that police forces all over the world need to be educated (if they're interested in the truth, and in justice rather than just getting someone (anyone) to confess to a crime) on the risk factors for false confessions.
Are we supposed to believe that the Italian police in this case conducted an interrogation that completely avoided all of these risk factors, when this is a problem for most other police forces in the world?!
In terms of things to avoid, there's all the obvious ones: violence, lack of legal representation, lack of a good interpreter doing their actual job, allowing 'comfort breaks' and food and drink. Then there's the less obvious: not undermining the suspect / witness's memory, not lying to suspects (or using this technique in a very controlled way, only under certain circumstances), only allowing a couple / few officers to take part in the interrogation.
In terms of what kind of witness / suspect one has to be very careful with:
1. Those who've never been in trouble with the law, and are likely to trust authority, and are predisposed to being as helpful as possible
2. Those with low IQs and /or mental deficiencies / learning difficulties / mental health problems.
3. Young people.
Here's a very interesting and timely (4 days old) article which highlights the need to educate police on this issue:
http://www.guardian.co.uk/uk/2011/oct/09/false-confessions-sean-hodgson-courts
It includes this statement: 'However, Gudjonsson added: "It is a myth that only people with mental illness or learning disabilities make false confessions to serious crimes. Interrogators do on occasions elicit false confessions to serious crimes from normal individuals. Greater awareness and improved police interview training are important in reducing the risk of police-induced false confession." '