Null argument in an unfair system. In a fair system you should at least get to hear the tape before you decide whether you want to make decisions on motioning against its admissibility.
I tend to agree that the one part of the Italian system that seems a little unfair is the classification of interviewees. This has been a feature of the thread, too.
1] You may suspect someone of a crime in Italy without legally declaring them a suspect.
2] Interviews in Italy are not necessarily recorded by audio or audio/visual means.
Are we all pretty much agreed on those things?
I spent some time about two months ago googling police interviewing techniques in the USA and they don't appear to materially differ in most cases. The police are encouraged to conduct the interviews in such a way that the suspect (or witness) does not feel compelled to "lawyer up". The studies I read showed that those jurisdictions requiring audio/video records are no less effective in producing admissible statements than those who don't.
It is almost bizarre that RS and AK allowed themselves to be interviewed on several occasions in the four days after Meredith's murder, had close contact with their families over this time, and did not realise that they were the focus of a serious criminal investigation. Or, more properly, that they did, and that they were warned (remember Sollecito's dad scolding him about taking the knife with him to the
Questura) and still did nothing.
We even know, from the contents of AK's 04 NOV 2007 alibi email, that she was apparently already told about her connection to the bathroom bloodstains.
The facts are that, in spite of any legal protections, AK continued to offer information that really ruined the inadmissibility of the early accusation against Patrick. By 05:45 on 06 NOV 2007, she had legal advice, and knew full well that she was no longer a witness but a suspect. How would audio/visual recordings have helped her then? Were they supposed to show four hours of her sitting there doing nothing and then asking for a pen and paper?
I have been trying to find an American equivalent of someone making an inadmissible statement during an interview and subsequently abjuring their Miranda rights and asking for writing materials to confirm their previous statements. Are you aware of any?