www.kenyalaw.org The International Crimes Act, 2008 (b) A decision of the Pre-Trial Chamber to act on its own initiative under this paragraph may be appealed by the Prosecutor. The appeal shall be heard on an expedited basis. 4. The admissibility of evidence preserved or collected for trial pursuant to this article, or the record thereof, shall be governed at trial by article 69, and given such weight as determined by the Trial Chamber. Article 57 Functions and powers of the Pre-Trial Chamber 1. Unless otherwise provided in this Statute, the Pre-Trial Chamber shall exercise its functions in accordance with the provisions of this article. 2. (a) Orders or rulings of the Pre-Trial Chamber issued under articles 15, 18, 19, 54, paragraph 2, 61, paragraph 7, and 72 must be concurred in by a majority of its judges. (b) In all other cases, a single judge of the Pre-Trial Chamber may exercise the functions provided for in this Statute, unless otherwise provided for in the Rules of Procedure and Evidence or by a majority of the Pre-Trial Chamber. 3. In addition to its other functions under this Statute, the Pre-Trial Chamber may: (a) At the request of the Prosecutor, issue such orders and warrants as may be required for the purposes of an investigation; (b) Upon the request of a person who has been arrested or has appeared pursuant to a summons under article 58, issue such orders, including measures such as those described in article 56, or seek such cooperation pursuant to Part 9 as may be necessary to assist the person in the preparation of his or her defence; (c) Where necessary, provide for the protection and privacy of victims and witnesses, the preservation of evidence, the protection of persons who have been arrested or appeared in response to a summons, and the protection of national security information; (d) Authorize the Prosecutor to take specific investigative steps within the territory of a State Party without having secured the cooperation of that State under Part 9 if, whenever possible having regard to the views of the State concerned, the Pre-Trial Chamber has determined in that case that the State is clearly unable to execute a request for cooperation due to the unavailability of any authority or any component of its judicial system competent to execute the request for cooperation under Part 9. (e) Where a warrant of arrest or a summons has been issued under article 58, and having due regard to the strength of the evidence and the 142