law: Drugs (Control) Act, 1950 
  9. Cash memorandum to be given of certain
  
  sales. — 
  (1) Every dealer or producer when selling any
  
  drug for cash shall, if the amount of the purchase in five rupees or more, in
  
  all cases, and, if the amount of the purchase is less than five rupees, when so
  
  requested by the purchaser, give to the purchaser a cash memorandum containing
  
  particulars of the transaction.
  (2) The Chief Commissioner may, by
  
  notification in the official Gazette, prescribe the particulars to be contained
  
  in any such cash memorandum.
  (3) The Chief Commissioner may, be
  
  notification in the official Gazette, exempt specified areas, classes of
  
  dealers or producers, or classes of drugs from the operation of this section.