8. General restrictions on return.
(2) A person accused of an offence shall not be returned under this Act, other than under section 11, to a declared Commonwealth or foreign territory, or committed to or kept in custody for the purposes of the return, if it appears as aforesaid that if charged with that offence in Trinidad and Tobago he would be entitled to be discharged under any rule of law relating to previous acquittal or conviction.
Ne bis in idem
Ne bis in idem - foreign court
Ne bis in idem - ICC
Ne bis in idem - other international court or tribunal
EDIT.