Article 14 Statement or confession of accused persons

(2) The Magistrate shall, before recording any such confession, explain to the accused person making it that he is not bound to make a confession and that if he does so it may be used as evidence against him and no Magistrate shall record any such confession unless, upon questioning the accused making it, he has reason to believe that it was made voluntarily

Article 55
Rights of persons during an investigation
2. Where there are grounds to believe that a person has committed a crime within the jurisdiction of the Court and that person is about to be questioned either by the Prosecutor, or by national authorities pursuant to a request made under Part 9, that person shall also have the following rights of which he or she shall be informed prior to being questioned:
(b) To remain silent, without such silence being a consideration in the determination of guilt or innocence