Where evidence of a person's conduct (including what they said and did not say) is led to support an inference, the hearsay rule precludes reasoning from that person's knowledge of a fact to the existence of that fact. The question of whether the hearsay rule applies to implied assertions involves characterisation: whether the conduct has the character of a subjective assertion involving knowledge or belief, or of an objective event. The plurality approach in Walton v The Queen, not Mason CJ's balancing approach, governs this characterisation. In medical negligence cases, a circumstantial case that a practitioner failed to give advice must overcome the onus of proof, and an appellate court will not interfere with a trial judge's choice between competing inferences unless the choice was one the trial judge should not have made.
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