law: Drugs (Control) Act, 1950 
  15. Procedure. — 
  (1) No person other than a police officer of
  
  or above the rank of an Inspector of Police or an officer not below the rank of
  
  an Inspector of Police authorized in this behalf by the Central Government by
  
  notification in the official Gazette, shall investigate any offence under this
  
  Act.
  (2) No prosecution for any offence punishable
  
  under this Act shall be instituted except with the previous sanction of the
  
  district Magistrate.