law: National Security Act, 1980
  13. Maximum period of detention
  The maximum period for which any person may be
  
  detained in pursuance of any detention order which has been confirmed under
  
  section 12 shall be twelve months from the date of detention:
  Provided that nothing contained in this section
  
  shall affect the power of the appropriate Government to revoke or modify the
  
  detention order at any earlier time.