law: 21. Power to call for information.-
  (1) The Initiating Officer or the Approving Authority or the Adjudicating Authority shall have power to require any officer of the Central Government or State Government or a local body or any person or officer who is responsible for registering and maintaining books of account or other documents containing a record of any transaction relating to any property or any other person to furnish any information in relation to any person, point or matter as in his opinion shall be useful for or relevant for the purposes of this Act.
  (2) Without prejudice to sub-section (1), every officer or person referred to in sub-section (1) shall furnish such information to any authority under this Act in such form and manner as may be prescribed.