They must also return, within forty-eight hours, any items, evidence and documents which may have been entrusted to them in order to carry out their task. They may also incur disciplinary measures which may include being removed from the list provided for in Article 157. The experts, in the course of their task, must liaise with the investigating judge or the delegated judge; they must keep him/her informed of the progress of their operations and put him/her in a position to take any appropriate measure at any time. In the course of his/her operations, the investigating judge, if he/she deems it necessary, may always get experts to assist him/her. If the experts ask to be enlightened on an issue which does not fall within their field of expertise, the judge may authorise them to be joined by persons, appointed by name, whose competence particularly qualifies them to do this. The persons thus appointed shall take an oath under the conditions laid down in Article 168. Their report shall be attached in its entirety to the experts’ report. ART 170: The investigating judge or magistrate appointed by the court shall present once more to the person charged, before forwarding them to the experts, the items under seal that have not been opened and identified. He/she shall enumerate these sealed articles in reports specially drawn up to attest to this handover. The experts must mention in their report any opening o r reopening of the seals which they identify. ART 171: The experts may receive, for information and for the strict performance of their task, statements from persons other than the person charged. If they consider that the person charged should be questioned, and unless the judge gives an exceptional and reasoned delegation, the investigating judge or magistrate designated by the court shall carry out the questioning in their presence, observing in all cases the forms and conditions provided in Articles 110 and 113. However, medical experts responsible for examining the person charged may ask him/her questions necessary for the accomplishment of their mission, without the presence of the judge or counsel. During expert operations, the parties may apply to the court that has commissioned them, in order that the experts be directed to make particular inquiries or to hear any person appointed by name who might be able to give them technical information. ART 172: When their operations end, the experts shall draft a report, which must include a description of their operations as well as their conclusions. The experts shall attest to have personally completed the task entrusted to them, and sign their report. Where several experts have been appointed and differ in their opinions, or if they have reservations to make concerning common conclusions, each one of them shall state his/her opinion or reservations and give his/her reasons. The report and the items under official seals or their residues shall be deposited with the registrar of the court which ordered the expert opinion. This deposit shall be acknowledged in a report. ART 173: The investigating judge or magistrate appointed by the court must summon the parties and inform them of the findings of the experts in the forms provided for under Articles 110 and 111. He/she shall take down their statements and set the time limit within which they may file submissions or applications, in particular for the purpose of supplementary expert appraisals or counter-appraisals. If these applications are rejected, the court seized must give a reasoned decision. This 33