Relevant Legal Principles
137 Where a ground of appeal against conviction asserts that a miscarriage of justice has occurred arising from the trial judge leaving to the jury a possible basis of conviction which had not been relied on by the Crown, a number of principles arise for consideration and application.
138 Firstly, a criminal trial is conducted as adversarial litigation: Whitehorn v The Queen (1983) 152 CLR 657 at 682; Nudd v The Queen (2006) 80 ALJR 614 at 618 [9]. An accusatorial process is involved in which the prosecution bears the onus of proving the guilt of the accused beyond reasonable doubt and in which the prosecution must put its case fully and fairly before the accused is called on: The Queen v Carroll (2002) 213 CLR 635 at 643 [21]; R v Ronen (2004) 62 NSWLR 707 at 722-3 [67]; Weiss v The Queen (2005) 80 ALJR 444 at 455 [43].
139 A cardinal principle of adversarial litigation is that, subject to carefully controlled qualifications, parties are bound by the conduct of their counsel, who exercise a wide discretion in deciding what issues to contest, what witnesses to call, what evidence to lead or to seek to have excluded, and what lines of argument to pursue: Nudd at 618 [9].
140 Secondly, the judge's role in a criminal trial is to hold the balance between the contending parties without himself taking part in their disputations; the judge does not exercise an inquisitorial role in which he seeks himself to remedy the deficiencies in the case on either side, nor is it part of the function of the trial judge to don the mantle of prosecution or defence counsel: Whitehorn at 682. The fundamental task of a trial judge is to ensure a fair trial: R v Meher [2004] NSWCCA 355 at paragraph 76. Trial judges should normally refrain from advancing an argument in support of the Crown case that was not put by the Crown. There are two reasons for the unacceptability of a judge using the summing up as a vehicle for strengthening the Crown case - first, it is inconsistent with judicial impartiality and secondly, to do so denies the prosecution and the defence the opportunity either to disavow, or to meet the argument: R v Meher at paragraphs 87-93.
141 Thirdly, the obligation of the Crown Prosecutor in opening the Crown case is not merely to outline the facts which the Crown proposes to establish in evidence, but to indicate, in conceptual terms, the nature of the Crown case to assist the trial judge, counsel for the accused and the jury: R v Tangye (1997) 92 A Crim R 545 at 556. Although there are no formal pleadings as such in criminal trials, the Crown is required to formulate the basis upon which it puts its case against the accused and essentially to adhere to that case: Tran v The Queen (2000) 105 FCR 182 at 203 [133].
142 If there is to be any change in the nature of the Crown case after the case was opened, it is vital that it be identified with some precision in the absence of the jury before counsel commence their final addresses: Tangye at 556. Where the prosecutor has nailed the Crown's colours to one version of events in opening, and has been permitted to depart from that position during the course of the case, the prejudice may, depending on the particular circumstances of the case, be so great as to warrant the conviction being quashed: Tran at 206 [148].
143 Fourthly, a trial judge is obliged to leave to the jury defences which appear to the judge to be reasonably open, notwithstanding that they have not been canvassed by defence counsel. This forms part of the obligation of the trial judge to ensure that the accused person has a fair trial according to law. There is, however, no corresponding obligation on the judge to give directions upon matters tending towards conviction: Solomon at 327. However, where the Crown has elected to formulate and present its case in a particular way, a question may arise as to whether there are other matters of fact or law which the trial judge, in the discharge of the duty to ensure a fair trial according to law, considers it necessary to put to the jury even though the matter was not propounded or developed by the Crown. The fairness or unfairness of travelling beyond the ground covered by the Crown will be evaluated by the trial judge and will be to the forefront in the decision as to how far, if at all, new considerations will be put to the jury: Solomon at 327-328, 336.
144 A trial judge who is considering instructing the jury concerning a basis for conviction which is not relied upon by the Crown must consider the fairness of such a course and, in particular, any tactical disadvantage which it may create for the accused: Solomon at 328, 333-334, 336; R v Pureau (1990) 19 NSWLR 372 at 377.
145 Relevant unfairness will ordinarily be looked for in procedural considerations. The judge will be appreciative of the tactical considerations which have governed counsel in the conduct of the case for the accused, including objections to evidence, lines of cross-examination, decisions concerning the tender of material and the content of the final address to the jury on behalf of the accused: Solomon at 328. Where it appears to a presiding judge that the evidence in the case leaves open a finding of guilt on a basis not opened by the Crown, the better course is to raise the matter with counsel prior to final addresses and then, according to the responses of counsel, a decision can be made whether it is appropriate that the direction be given. If it is to be given, the jury will have the benefit of the submissions of both counsel upon the question: Solomon at 336. The accused then will not be deprived of the opportunity of having submissions made on his behalf on that issue: Solomon at 336; GAS at 863, 877-8; R v King at 187; King v The Queen at 432-3; Carr at 285 [49]; R v Whitfield [2002] NSWCCA 501 at paragraph 67.
146 Unfairness to the accused in the conduct of the trial resulting from the trial judge's direction to the jury upon a basis for conviction not relied upon by the Crown may arise from a range of tactical disadvantages, including an inability to cross-examine Crown witnesses, adduce evidence in the defence case and make closing submissions to the jury on the matter: Solomon at 328, 336; GAS at 863; Carr at 285 [49]. Even if the prejudice to the accused was confined to the inability to address the jury upon the question, that itself is capable of being a most significant area of prejudice: R v RTB [2002] NSWCCA 104 at paragraphs 55-61; Meher at paragraphs 113-116, 130; Carr at 285 [49].
147 A miscarriage of justice may arise where the Crown elects to confine the basis for conviction to acceptance of critical Crown witnesses with no alternative and inconsistent factual scenario being advanced by the Crown. In such circumstances, defence counsel will address the jury to answer the Crown's case theory advanced in the closing address. If then, for the first time, the trial judge advances an alternative factual scenario based upon rejection of significant parts of critical Crown witnesses, the conduct of the trial may have altered. The Crown has been saved from the need to advance bases for conviction which are inconsistent. The defence counsel is deprived of the opportunity of addressing the jury upon the basis that the Crown is advancing inconsistent bases for conviction. The participants in the trial, including the Crown, the accused and the jury will hear, for the first time, the alternative basis for conviction being advanced by the trial judge in the summing up. Unfairness of this type leading to a miscarriage of justice was found to exist in Carr at 285 [49].
148 Fifthly, where the trial judge raises in the summing up a basis for conviction which was not relied upon by the Crown, there is the added difficulty that the direction carries particular force because it is coming from the judge and not the Crown: RTB at paragraphs 57, 60. It may produce positive mischief if the judge raises arguments which could have been, but which were not put or requested by counsel: R v Heuston (1995) 81 A Crim R 387 at 393.
149 Sixthly, the question to be considered by the Court of Criminal Appeal is whether there has been an unfairness to the accused which gives rise to a miscarriage of justice by reason of the conduct of the trial and which requires the Court's intervention: Solomon at 328, 336; R v King at 187; Carr at 285 [49].