The Jones v Dunkel principle has two distinct aspects: first, an inference that uncalled evidence would not have helped the party who failed to call it; and second, an evaluative aspect by which the failure may be used to resolve doubts, ambiguities and conflicts in the evidence actually given. A trial judge sitting alone who fails to advert to and apply the evaluative aspect commits a misdirection that may warrant a new trial. There is also an overriding obligation to weigh evidence according to the respective powers of the parties to produce it.
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