law: National Security Act, 1980
  3. Power to make orders detaining certain
  
  persons
  (1) The Central Government or the State
  
  Government may,-
  (a) if satisfied with
  
  respect to any person that with a view to preventing him from acting in any
  
  manner prejudicial to the defense of India, the relations of India with foreign
  
  powers, or the security of India, or
  (b) if 
  
  satisfied with respect to any foreigner that with a view to regulating his
  
  continued presence in India or with a view to
  
  making arrangements for his expulsion from India , it is necessary so
  
  to do, make an order directing that such person be detained.
  (2) The Central Government or the State
  
  Government may, if satisfied with respect to any person that with a view to preventing
  
  him from acting in any manner prejudicial to the security of the State or from
  
  acting in any manner prejudicial to the maintenance of Public order or from
  
  acting in any manner prejudicial to the maintenance of supplies and services
  
  essential to the community it is necessary so to do, make an order directing
  
  that such person be detained.
  Explanation.- For the purposes of
  
  this sub-section, "acting in any manner prejudicial to the maintenance of
  
  supplies and services essential to the community" does not include
  
  "acting in any manner prejudicial to the maintenance of supplies of
  
  commodities essential to the community" as defined in the Explanation to
  
  sub-section (1) of section 3 of the Prevention of Black-marketing and
  
  Maintenance of Supplies of Essential Commodities Act, 1980, and accordingly, no
  
  order of detention shall be made under this Act on any ground on which an order
  
  of detention may be made under that Act.
  (3) If, having regard to the circumstances
  
  prevailing or likely to prevail in any area within the local limits of the
  
  jurisdiction of a District Magistrate or a Commissioner of Police, the State
  
  Government is satisfied that it is necessary so to do, it may, by order in
  
  writing, direct, that during such period as may be specified in the order, such
  
  District Magistrate or Commissioner of Police may also, if satisfied as
  
  provided in sub-section (2), exercise the powers conferred by the said
  
  sub-section:
  Provided that the period specified in an order
  
  made by the State Government under this sub-section shall not, in the first
  
  Instance, exceed three months, but the State Government may, if satisfied as
  
  aforesaid that it is necessary so to do, amend such order to extend such period
  
  from time to time by any period not exceeding three months at any one time.
  (4) When any order is made under this section
  
  by an officer mentioned in sub-section (3), he shall forthwith report the fact
  
  to the State Government to which he is subordinate together with the grounds on
  
  which the order has been made and such other particulars as, in his opinion,
  
  have a bearing on the matter, and no such order shall remain in force for more
  
  than twelve days after the making thereof unless, in the meantime, it has been
  
  approved by the State Government:
  Provided that where under section 8 the grounds
  
  of detention are communicated by the officer making the order after five days
  
  but not later than ten days from the date of detention, this sub-section shall
  
  apply subject to the modification that, for the words "twelve days",
  
  the words "fifteen days" shall be substituted.
  (5) When any order is made or approved by the
  
  State Government under this section, the State Government shall, within seven
  
  days, report the fact to the Central Government together with the grounds on
  
  which the order has been made and such other particulars as, in the opinion of
  
  the State Government, have a bearing on the necessity for the order.