Clause 28

A certificate purporting to be signed by a Government Chemist and purporting to be a report by him upon any matter or thing duly submitted to him for examination or analysis may be used as evidence in any proceedings for an offence under this Act on its production by the prosecution without proof of signature and shall be prima facie evidence of all matters contained therein.(2) Where the accused person desires to examine a Government Chemist on his report he may require the court to summon that Chemist to give evidence and the court shall thereupon summon that Chemist as a witness for the prosecution.(3) A Government Chemist shall be bound to state the truth in a report made under his hand.”.