An Act to provide for the detention, prosecution and punishment of persons for genocide, crimes against humanity, war crimes and other crimes under international law.
8 Investigation
(5) Such person shall be bound to answer all questions put to him by an Investigation Officer and shall not be excused from answering any question on the ground that the answer to such question will criminate, or may tend directly or indirectly to criminate, such person:
Provided that no such answer, which a person shall be compelled to give, shall subject him to any arrest or prosecution, or be proved against him in any criminal proceeding.
Fair trial standards
Rights during investigation - self incrimination
Procedure for witness testimony - national proceedings
EDIT.