1. A distinction must be drawn between cases of legal or technical inconsistency and cases of suggested factual inconsistency. The former will generally be easier to resolve. On the face of the court's record there will be two verdicts which, in law, cannot stand together. Examples include the case where the accused was convicted both of an attempt to commit an offence and the completed offence or of being, in respect of the same property and occasion, both the thief and the receiver. There are other like cases. Where technical or legal inconsistency is established, it must be inferred that the jury misunderstood the judge's directions on the law; compromised disputes amongst themselves; or otherwise fell into an unidentifiable error. The impugned verdict or verdicts must be set aside and appropriate consequential orders made.
2. Suggestions of factual inconsistency have arisen both as between different verdicts affecting the same accused and different verdicts affecting co-accused or persons tried separately in relation to connected events. The last-mentioned problem is an inevitable risk of the trial system where accused offenders are tried separately. Thus in R v Rowley the appellant was convicted after a plea of guilty. The principals in the offence were later acquitted after a trial. The appellant gained an order quashing his conviction. Yet it was pointed out that apparently inconsistent verdicts in such circumstances might be no more than the result of 'differences in the evidence presented at the two trials' or 'the different views which the juries separately take of the witnesses'.
3. Where, as is ordinarily the case, the inconsistency arises in the jury verdicts upon different counts of the originating process in a criminal trial, the test is one of logic and reasonableness. A judgment of Devlin J in R v Stone is often cited as expressing the test :
"He must satisfy the court that the two verdicts cannot stand together, meaning thereby that no reasonable jury who had applied their mind properly to the facts in the case could have arrived at the conclusion, and once one assumes that they are an unreasonable jury, or they could not have reasonably come to the conclusion, then the convictions cannot stand."
4. Nevertheless, the respect for the function which the law assigns to juries (and the general satisfaction with their performance) have led courts to express repeatedly, in the context both of criminal and civil trials, reluctance to accept a submission that verdicts are inconsistent in the relevant sense. Thus, if there is a proper way by which the appellate court may reconcile the verdicts, allowing it to conclude that the jury performed their functions as required, that conclusion will generally be accepted. If there is some evidence to support the verdict said to be inconsistent, it is not the role of the appellate court, upon this ground, to substitute its opinion of the facts for one which was open to the jury. In a criminal appeal, the view may be taken that the jury simply followed the judge's instruction to consider separately the case presented by the prosecution in respect of each count and to apply to each count the requirement that all of the ingredients must be proved beyond reasonable doubt. Alternatively, the appellate court may conclude that the jury took a 'merciful' view of the facts upon one count: a function which has always been open to, and often exercised by, juries. The early history of New South Wales was affected by English juries which, in the face of clear evidence, declined to find the value of goods stolen sufficient to attract the punishment of death, thereby affording to the offender the alternative punishment of transportation. Australian decisions have acknowledged that the role of the jury continues to be ameliorative in this respect.
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5. Nevertheless, a residue of cases will remain where the different verdicts returned by the jury represent, on the public record, an affront to logic and commonsense which is unacceptable and strongly suggests a compromise of the performance of the jury's duty. More commonly, it may suggest confusion in the minds of the jury or a misunderstanding of their function, uncertainty about the legal differentiation between the offences or lack of clarity in the judicial instruction on the applicable law. It is only where the inconsistency rises to the point that the appellate court considers that intervention is necessarily required to prevent a possible injustice that the relevant conviction will be set aside. It is impossible to state hard and fast rules. "It all depends upon the facts of the case."
6. The obligation to establish inconsistency of verdicts rests upon the person making the submission. But if, because of inconsistency between verdicts, the appellate court is persuaded that a verdict cannot stand, it must make consequential orders. In the case of a criminal trial, where the verdict has been followed by conviction and sentence, these must be set aside. Where the inconsistency is found between verdicts of acquittal and a verdict of guilty, the appellate court (statute apart) may not disturb the acquittal. It may be appropriate to enter a verdict of acquittal on the subject count(s) on the footing that this merely carries forward the logic of the other acquittal verdict(s). But once again, the relief which is appropriate depends upon the facts of the particular case.[11]