Article 28:
During the process of collection of evidence, the criminal investigation officer shall hear statements of those who may possess information with respect to facts and perpetrators of crimes, question any suspect, and enter the same in the relevant records. They may seek the assistance of experts, including physicians, and seek their advice in writing.
Article 95:
The Investigator shall hear the statements of the witnesses called by the litigants unless he considers that their testimony would be useless. He may also hear statements from others whom he deems necessary with respect to the facts that may lead to the proof of the crime, its circumstances, and its attribution to the accused or his innocence.
Article 96:
The Investigator shall enter into the record full information about each witness, including the name of the witness, his surname, age, profession, nationality, place of residence and his relationship to the accused, the victim and the claimant of the private right of action.
1. States Parties shall, in accordance with the provisions of this Part and under procedures of national law, comply with requests by the Court to provide the following assistance in relation to investigations or prosecutions:
(c) The questioning of any person being investigated or prosecuted;