Certificate of examination to be admissible in evidence
9. Where, in any proceedings under this Act ,any question arises as to whether kerosene or any mixture of kerosene with any other petroleum product has been used for the purpose of operating any motor vehicle, the certificate of any examiner to the effect that he has examined the vehicle and stating the result of his examination, shall be admissible in evidence and shall be sufficient prima facie evidence of any fact or opinion stated therein relating to the matter in question, and the court shall not permit the examiner to be called for cross-examination on the certificate unless contrary evidence is given which appears to the court to be credible, or unless for any reason the court considers such cross-examination to be necessary in the interests of justice. |