law: Drugs (Control) Act, 1950 
  10. Marking of prices and exhibiting list of
  
  prices and stocks. — 
  (1) The Chief Commissioner may direct dealers or
  
  producers in general, or any dealer or producer in particular to mark any drug
  
  exposed or intended for sale with the sale prices or to exhibit on the premises
  
  a price list of drugs held  for sale and the quantities of such drugs in
  
  his possession, and may further give directions as to the manner in which any
  
  such direction as aforesaid is to be carried out.
  (2) No dealer shall destroy, efface or alter
  
  or cause to be destroyed, effaced or altered any label or mark affixed to a
  
  drug and indicating the price marked by a producer.