law: The National Investigation Agency Act, 2008
  Chapter II National
  
  Investigation Agency
  3.Constitution of National Investigation
  
  Agency.
  1.  
  
    Notwithstanding
  
  anything in the Police Act, 1861, the Central Government may constitute a
  
  special agency to be called the National Investigation Agency for investigation
  
  and prosecution of offences under the Acts specified in the Schedule.
  2.  
  
    Subject
  
  to any orders which the Central Government may make in this behalf, officers of
  
  the Agency shall have throughout India in relation to the investigation of
  
  Scheduled Offences and arrest of persons concerned in such offences, all the
  
  powers, duties, privileges and liabilities which police officers have in
  
  connection with the investigation of offences committed therein.
  3.  
  
    Any
  
  officer of the Agency of, or above, the rank of Sub-Inspector may, subject to
  
  any orders which the Central Government may make in this behalf, exercise
  
  throughout India, any of the powers of the officer-in-charge of a police
  
  station in the area in which he is present for the time being and when so exercising
  
  such powers shall, subject to any such orders as aforesaid, be deemed to be an
  
  officer-in-charge of a police station discharging the functions of such an
  
  officer within the limits of his station.