The parties may, during the investigation, submit to the investigating judge a written and reasoned request that they be heard or questioned, that a witness be heard, that they be confronted or transported to the scene, that an order be made for the production by one of them of a document useful to the investigation, or that any other acts that they deem necessary to ascertain the truth be carried out. On pain of nullity, this request must be made in accordance with the provisions of the tenth paragraph of Article 81; it must relate to specific acts and, where it concerns a hearing, specify the identity of the person whose hearing is sought.
If the investigating judge does not intend to grant the request, he must issue a reasoned order within one month of receiving the request. The provisions of the last paragraph of article 81 are applicable.
At the end of a period of four months since his last appearance, the accused person who so requests in writing must be heard by the examining magistrate. The examining magistrate shall proceed with the examination within thirty days of receipt of the request, which must be made in accordance with the provisions of the tenth paragraph of Article 81.