For evidence to be 'substantial' under s 353A(6)(b) of the Criminal Law Consolidation Act 1935 (SA), it must reach both a qualitative and quantitative threshold — it must subsist or stand by itself, not merely confirm what was already before the jury at trial. Fresh expert evidence based on subsequent scientific research that confirms the correctness of a defence expert's trial opinion, without adding a materially different dimension, will not satisfy the 'substantial' requirement. The majority and dissent sharply diverge on whether evidence that incontrovertibly falsifies the scientific foundation of a prosecution expert's opinion is 'substantial' when a defence expert had already challenged that opinion at trial on less rigorous grounds.
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