From:
http://www.wikiwand.com/en/Italian_Code_of_Criminal_Procedure
Interrogations and self-incriminating statements
When a person who is neither an indagato (suspect) nor an imputato (defendant), interrogated by the police or the prosecutor, reveals pieces of information that might lead to his incrimination,
the interrogation must be immediately stopped, the person must be invited to nominate a lawyer and be warned that the information disclosed may render necessary an investigation. These self-incriminating statements are inadmissible in court.[12]
The police or the prosecutor summon the indagato, during the preliminary investigations, and inform him precisely of the actions he is alleged to have committed (not yet technically a charge); they also inform him of the evidence so far gathered against him, if this is not detrimental to the investigations; the indagato is also invited to defend himself, if he so wishes; the police or the prosecutor can also ask him questions, that he may refuse to answer.[13]
The indagato, when interrogated, must be free of all undue influence, both psychological and physical. He must be willing to provide information (animus confitendi). The police or the prosecutor cannot use on the indagato any methods or techniques that may influence his right to self-determination or alter his memory or his capability to evaluate facts. This prohibition applies even if it was the indagato who asked that these methods or techniques be used. Before the interrogation begins, the indagato must be informed that his statements can be used against him in court; that he can choose not to answer the question, but that the investigations will proceed nonetheless; that, if he provides information concerning someone else's criminal responsibility, he will assume, as far as this responsibility is concerned, the office of witness.[14]
If evidence should be gathered in violation of these principles, it would be inadmissible in court.
Footnotes:
12. CCP Art. 63
13. CCP Art. 65
14. CCP Art. 64