law: Drugs and Cosmetics Act, 1940
  25. Reports of Government Analysts
  (1) The Government Analyst to whom a sample of any drug 87[or
  
  cosmetic] Government has been submitted for test or analysis under sub-section
  
  (4) of section 23, shall deliver to the Inspector submitting it a signed report
  
  in triplicate in the prescribed form.
  (2) The Inspector on receipt thereof shall deliver one copy of
  
  the report to the person from whom the sample was taken 108[and
  
  another copy to the person, if any, whose name, address and other particulars
  
  have been disclosed under section 18A], and shall retain the third copy for use
  
  in any prosecution in respect of the sample.
  (3) Any document purporting to be a report signed by a
  
  Government Analyst under this Chapter shall be evidence of the facts stated
  
  therein, and such evidence shall be conclusive unless the person from whom the
  
  sample was taken 109[or the person whose name, address and other
  
  particulars have been disclosed under section 18A] has, within twenty-eight
  
  days of the receipt of a copy of the report, notified in writing the Inspector
  
  of the Court before which any proceedings in respect of the sample are pending
  
  that he intends to adduce evidence in controversion of the report.
  (4) Unless the sample has already been tested or analyzed in the
  
  Central Drugs Laboratory, where a person has under subsection (3) notified his
  
  intention of adducing evidence in controversion of a Government Analyst's
  
  report, the Court may, of its own motion or in its discretion at the request
  
  either of the complainant or the accused cause the sample of the drug 87[or
  
  cosmetic] produced before the Magistrate under sub-section (4) of section 23 to
  
  be sent for test or analysis to the said Laboratory, which shall make the test
  
  or analysis and report in writing signed by, or under the authority of, the
  
  Director of the Central Drugs Laboratory the result thereof, and such report
  
  shall be conclusive evidence of the facts stated therein.
  (5) The cost of a test or analysis made by the Central Drugs
  
  Laboratory under sub-section (4) shall be paid by the complainant or accused as
  
  the Court shall direct.