law: The Collection of Statistics Act, 2008
  Chapter II Collection
  
  of Statistics
  3. Collection of
  
  statistics.
  The appropriate
  
  Government may, by notification in the Official Gazette, direct that the
  
  statistics on economic, demographic, social, scientific and environmental
  
  aspects shall be collected through a statistical survey or otherwise, and
  
  thereupon the provisions of this Act shall apply in relation to those
  
  statistics: Provided that-
  a.  
  
    nothing
  
  contained in this section shall be deemed to authorise a State Government or
  
  Union territory Administration or any local government to issue any direction
  
  with respect to the collection of statistics relating to any matter falling
  
  under any of the entries specified in List I (Union List) in the Seventh
  
  Schedule to the Constitution; or
  b.  
  
    where
  
  the Central Government has issued any direction under this section for the
  
  collection of statistics relating to any matter, no State Government or Union
  
  territory Administration or any local government shall, except with the
  
  previous approval of the Central Government, issue any similar direction for so
  
  long as the collection of such statistics by the Central Government remain to
  
  be completed; or
  c.  
  
  
  
    where
  
  a State Government or Union territory Administration or any local government
  
  has issued a direction under this section for the collection of statistics
  
  relating to any matter, the Central Government shall not issue any similar
  
  direction for so long as the collection of such statistics by the State
  
  Government remain to be completed, except in cases where such statistics have
  
  to be collected with reference to two or more States or Union territories.