law: Narcotic Drugs and Psychotropic Substances Act, 1985
  3. Power to add to or omit from the
  
  list of psychotropic substances.
  The Central Government may, if satisfied that it is necessary or
  
  expedient so to do on the basis of-
  (a) the information and evidence which has become available to
  
  it with respect to the nature and effects of, and the abuse or the scope for
  
  abuse of, any substance (natural or synthetic) or natural material or any salt
  
  or preparation of such substance or material; and
  (b) the modifications or provisions (if any) which have been
  
  made to, or in, any International Convention with respect to such substance,
  
  natural material or salt or preparation of such substance or material, by
  
  notification in the Official Gazette, add to, or, as the case may be, omit
  
  from, the list of psychotropic substances specified in the Schedule such
  
  substance or natural material or salt or preparation of such substance or
  
  material.