law: 8. Prohibition of return of India of transferred prisoners.-
  (1) No person who has been transferred to Pakistan under the provisions of this Act shall return to India except with the permission in writing of the Central Government.
  (2) If any person contravenes the provisions of sub-section (1), he shall be punishable with imprisonment for a term which may extend to three years, and if at the time of his transfer to Pakistan, he was undergoing a sentence of imprisonment in India, he shall further be sentenced to undergo the unexpired portion of such sentence without taking into account any period for which he may have been detained or confined in Pakistan after the transfer.
  (3) If at the time of his transfer to Pakistan, the person contravening the provisions of sub-section (1) was undergoing trial in any Court in India for any offence, he shall, without prejudice to the provisions of sub-section (2), be liable to be tried for such offence by the same or any other Court having jurisdiction: Provided that if such person has, before his return to India, been tried for the offence by a Court of competent jurisdiction in Pakistan and convicted or acquitted of the offence, he shall not be liable to be tried again for the same offence by any Court in India.