Chapter II Cooperation with the International Criminal Court
Section 2 Provision of Evidence, etc.
Subsection 3 Transfer of a Sentenced Inmate for Testimony, etc.
(Decision, etc. on the Transfer of a Sentenced Inmate for Testimony, etc.)
Article 17 (1) Where the Minister of Justice has received documents sent by the Minister of Foreign Affairs pursuant to the provisions of Article 4 concerning a request for cooperation through the transfer of a sentenced inmate for testimony, etc., when the case neither falls under Article 6, paragraph (1), item (iv) nor falls under any of the following items, and when the Minister of Justice finds it reasonable to comply with the request, he/she shall make an affirmative decision to transfer the sentenced inmate for testimony, etc., setting a period not to exceed thirty days during which the transfer of the domestic sentenced inmate will be in effect:
(i) when the domestic sentenced inmate does not consent in writing;
(ii) when the domestic sentenced inmate is under the age of 20; or
(iii) when a case connected with the crime committed by the domestic sentenced inmate is pending before a Japanese court.
(2) Where the Minister of Justice makes the affirmative decision set forth in the preceding paragraph, when he/she finds it necessary, he/she shall set conditions concerning the transfer of the sentenced inmate for testimony, etc.
(3) When the Minister of Justice decides not to effect the transfer of a sentenced inmate for testimony, etc. on finding that it is unreasonable to comply with the request set forth in paragraph (1), or when he/she sets the conditions set forth in the preceding paragraph, the Minister of Justice shall consult with the Minister of Foreign Affairs in advance.
(4) The provisions of Article 19, paragraph (3) of the Act on International Assistance in Investigations and Other Related Matters shall apply mutatis mutandis to a case in which the decision set forth in paragraph (1) has been made.
(Measures Concerning the Surrender of a Domestically Sentenced Inmate, etc.)
Article 18 (1) When the Minister of Justice has issued an order under the provisions of Article 19, paragraph (3) of the Act on International Assistance in Investigations and Other Related Matters as applied mutatis mutandis pursuant to paragraph (4) of the preceding Article, he/she shall send a written permit of custody to the Minister of Foreign Affairs.
(2) When the Minister of Foreign Affairs has been sent a permit of custody under the provisions of the preceding paragraph, he/she shall immediately send the same to the ICC.
(3) The warden of a penal institution who has been issued the order prescribed in paragraph (1) or an official of the penal institution who has been nominated by that warden shall promptly escort the domestic sentenced inmate to the place designated by the ICC, and shall surrender said domestic sentenced inmate to the person designated by the ICC who is in possession of the permit of custody.
(4) The provisions of Articles 21 and 22 of the Act on International Assistance in Investigations and Other Related Matters shall apply mutatis mutandis to a domestic sentenced inmate with regard to his/her surrender, pursuant to the provisions of the preceding paragraph, to the person designated by the ICC. In this case, the "transfer of a sentenced inmate for testimony" in Article 21 of said Act shall be deemed to be replaced with "transfer of a sentenced inmate for testimony, etc. as prescribed in Article 2, item (vii) of the Act on Cooperation with the International Criminal Court."
Other forms of cooperation
Cooperation under procedures of national law
Temporary transfer of persons in custody for purposes of identification or for obtaining testimony or other forms of assistance - national procedures for ICC proceedings
EDIT.