71(2)Subject to subsections (3) and (4), a certificate stating that a qualified technician has analyzed or examined any of the things listed in subsection (1) and stating the result of the qualified technician’s analysis is admissible in evidence in a prosecution with respect to an offence under this Act or the regulations and, in the absence of evidence to the contrary, is proof of the statements contained in the certificate without proof of the appointment, authority or signature of the person purporting to have signed the certificate.