A certificate tendered under s 79B(10) of the Road Traffic Act 1961 (SA) creates a rebuttable presumption as to the facts certified, and the defendant bears the burden of adducing 'proof to the contrary'. Bare assertions without supporting evidence are insufficient to discharge that burden. Photographic detection devices approved under the Road Traffic (Miscellaneous) Regulations 1999 (SA) do not require certification under the National Measurements Act 1960 (Cth).
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