The proof is in the pudding; standard of proof when allegations are serious

When an issue falls for determination on the balance of probabilities and the determination depends on a choice between competing and mutually inconsistent allegations of fraudulent conduct, generalisations about the need for clear and cogent proof are likely to be at best unhelpful and at worst misleading. If such generalisations were to affect the proof required of the party bearing the onus of proving the issue, the issue would be determined not on the balance of probabilities but by an unbalanced standard. The most that can be validly said in such a case is that the trial judge should be conscious of the gravity of the allegations made on both sides when reaching his or her conclusion. Ultimately, however, it remains incumbent upon the trial judge to determine the issue by reference to the balance of probabilities.
Re Neat Holdings Pty Ltd (1992) 110 ALR 449