(1) The powers of the Commission shall be defined by Act of Parliament and shall include the power -
(a) to issue subpoenas requiring the attendance of any person before the Commission and the production of any document or record relevant to any investigation by the Commission;
(b) to cause -any person contemptuous of any such subpoena to be prosecuted before a competent Court;
(c) to question any person in respect of any subject matter under investigation before the Commission;
(d) to require any person to disclose truthfully and frankly any information within his knowledge relevant to any investigation by the Commissioner.
(2) The Commissioner shall not investigate -
(a) a matter which is pending before a court or judicial tribunal; or
(b) a matter involving the relations or dealings between the Government and any other Government or an international organization; or
(c) a matter relating to the exercise of the prerogative of mercy.