law: National Security Act, 1980
  14. Revocation of detention orders
  (1) Without prejudice to the provisions of
  
  section 21 of the General Clauses Act, 1897, a detention order may, at any
  
  time, be revoked or modified,-
  (a) notwithstanding
  
  that the order has been made by an officer mentioned in sub-section (3) of
  
  section 3, by the State Government to which that officer is subordinate or by
  
  the Central Government;
  (b) notwithstanding
  
  that the order has been made by a State Government, by the Central Government.
  2[(2) The expiry or revocation of a detention
  
  order (hereafter in this sub-section referred to as the earlier detention
  
  order) shall not [whether such earlier detention order has been made before or
  
  after the commencement of the National Security (Second Amendment) Act, 1984]
  
  bar the making of another detention order (hereafter in this sub-section
  
  referred to as the subsequent detention order) under section 3 against the same
  
  person:
  Provided that in a case where no fresh facts
  
  have arisen after the expiry or revocation of the earlier detention order made
  
  against such person, the maximum period for which such person may be detained
  
  in pursuance of the subsequent detention order shall, in no case, extend beyond
  
  the expiry of a period of twelve months from the date of detention under the
  
  earlier detention order.]