law: The National Investigation Agency Act, 2008
  18. Sanction for
  
  prosecution. -
  No prosecution, suit
  
  or other legal proceedings shall be instituted in any court of law, except with
  
  the previous sanction of the Central Government, against any member of the
  
  Agency or any person acting on his behalf in respect of anything done or
  
  purported to be done in exercise of the powers conferred by this Act.