23.— (1) A person who purports to be a CVR test operator or CVR tester while knowing that he or she is not so authorised (or while knowing that such authorisation is suspended) commits an offence.

(2) A certificate purporting to be signed by an officer of the Authority and to specify that on a specified day or days, or during the whole of a specified period, a specified person was or was not the holder of an authorisation shall without proof of the signature of the person purporting to sign the certificate or that he or she was an officer of the Authority be evidence, until the contrary is shown, of the matters purporting to be certified in and by the certificate.