(d) A description of the assistance sought and details of any particular procedure that the requesting State Party wishes to be followed; (e) Where possible, the identity, location and nationality of any person concerned; and (f) The purpose for which the evidence, information or action is sought. 16. The requested State Party may request additional information when it appears necessary for the execution of the request in accordance with its domestic law or when it can facilitate such execution. 17. A request shall be executed in accordance with the domestic law of the requested State Party and, to the extent not contrary to the domestic law of the requested State Party and where possible, in accordance with the procedures specified in the request. 18. Wherever possible and consistent with fundamental principles of domestic law, when an individual is in the territory of a State Party and has to be heard as a witness or expert by the judicial authorities of another State Party, the first State Party may, at the request of the other, permit the hearing to take place by video conference if it is not possible or desirable for the individual in question to appear in person in the territory of the requesting State Party. States Parties may agree that the hearing shall be conducted by a judicial authority of the requesting State Party and attended by a judicial authority of the requested State Party. 19. The requesting State Party shall not transmit or use information or evidence furnished by the requested State Party for investigations, prosecutions or judicial proceedings other than those stated in the request without the prior consent of the requested State Party. Nothing in this paragraph shall prevent the requesting State Party from disclosing in its proceedings information or evidence that is exculpatory to an accused person. In the latter case, the requesting State Party shall notify the requested State Party prior to the disclosure and, if so requested, consult with the requested State Party. If, in an exceptional case, advance notice is not possible, the requesting State Party shall inform the requested State Party of the disclosure without delay. 20. The requesting State Party may require that the requested State Party keep confidential the fact and substance of the request, except to the extent necessary to execute the request. If the requested State Party cannot comply with the requirement of confidentiality, it shall promptly inform the requesting State Party. 21. Mutual legal assistance may be refused: 23