Submissions
16The accused has foreshadowed that he intends to raise the issue of the partial defence of substantial impairment pursuant to s 23A of the Crimes Act 1900. A notice pursuant to s 151 of the Criminal Procedure Act has been served. Section 23A is relevantly as follows:
"23A Substantial impairment by abnormality of mind
(1) A person who would otherwise be guilty of murder is not to be convicted of murder if:
(a) at the time of the acts or omissions causing the death concerned, the person's capacity to understand events, or to judge whether the person's actions were right or wrong, or to control himself or herself, was substantially impaired by an abnormality of mind arising from an underlying condition, and
(b) the impairment was so substantial as to warrant liability for murder being reduced to manslaughter.
(2) For the purposes of subsection (1) (b), evidence of an opinion that an impairment was so substantial as to warrant liability for murder being reduced to manslaughter is not admissible.
(3) ...
(4) The onus is on the person accused to prove that he or she is not liable to be convicted of murder by virtue of this section.
(5) A person who but for this section would be liable, whether as principal or accessory, to be convicted of murder is to be convicted of manslaughter instead.
(6) ...
(8) In this section:
'underlying condition' means a pre-existing mental or physiological condition, other than a condition of a transitory kind."
17According to the accused, the central issue in the trial will be whether he should be found not guilty of murder but guilty of manslaughter due to the substantial impairment of his mind as the result of an underlying condition. There is competing expert medical evidence before me, some at least of which supports the proposition that the accused is suffering from an Autistic Spectrum Disorder or what was at one time commonly described as Asperger's Syndrome. It is anticipated that these expert witnesses will give evidence in support of the existence and severity of this condition. It is unnecessary for present purposes to refer extensively to this material or to analyse it in detail. It is sufficient to observe that one expert medical opinion upon which it is anticipated the accused will rely contains the following conclusion:
"All this suggests strongly that the accused's Asperger disorder and comorbid depression with or without alcohol related and/or perinatal brain damage caused substantial impairment with regard to his capacity to retain self-control at the time of the killing whilst in the midst of a heated argument with his wife."
18It can reasonably be anticipated that this opinion will be in contest at the trial and that the Crown will call competing expert medical evidence.
19In these circumstances the accused submitted that it is in the interests of justice for a judge to make the determination in this case. This is said to be at least for the following reasons. First, a judge is likely to be more experienced in assessing and weighing expert opinion evidence. Secondly, a judge is less likely to be inappropriately influenced by the tragic and violent facts of the case, which are to a large extent not in dispute. Thirdly, the accused desires a trial by judge alone and the opinion of an accused person may be relevant to the issue. Fourthly, the trial does not require the application of objective community standards to any significant degree, if at all. The issues of intention or the assessment of expert opinion do, or at least may, not involve the application of community standards. Finally, s 23A(2) prevents evidence of opinion in relation to the degree of impairment being adduced so that the ultimate question for the tribunal of fact is a question of degree rather than one concerned with the application of objective community standards.
20It should be noted that the Crown disputes the last two reasons upon which the accused relies.
21The accused contended that as the central issue in the case revolved around competing expert opinions regarding a medical condition, it was therefore in the interests of justice that the final decision on that issue be supported by reasons given by a judge, rather than that the decision remain shrouded in the uncertain and unverifiable processes of the jury. He cited Martin CJ in Arthurs v State of Western Australia [2007] WASC 182 at [59] and [89] as follows:
"[59] In the limited time available my researches have only identified three decisions dealing with the section. Two of those, The State of Western Australia v Tarau [2005] WASC 290 and The State of Western Australia v Iley [2006] WASC 107, were cases in which the application was granted on the ground that the essential issue for determination was whether the accused person was not guilty by reason of insanity. Because that issue will obviously turn largely upon the evaluation of expert evidence in each of those cases it was considered appropriate to grant the application.
...
[89] Despite their training and experience, it would, I think, be unwise to assume that Judges are any less vulnerable to human emotions and frailty than any other member of the community. However, it is in this context that an obligation to provide reasons appears to me to be of particular significance. Through the performance of that obligation, the accused person, the community and where necessary an appeal court can evaluate whether, and if so the extent to which emotion may have influenced the decision, at least to a greater extent than in the case of a jury verdict. That consideration seems to me to lend weighty support in this case to the proposition that trial by Judge without jury is in the interests of justice."
22In opposing the application the Crown drew my attention to the speech of the Honourable J W Shaw, the then Attorney General and Minister for Industrial Relations on the occasion of the Second Reading of the Crimes Amendment (Diminished Responsibility) Bill that preceded the ultimate passage of s 23A into law. The Attorney's speech was quite detailed but for presently relevant purposes can be limited to the following:
"The centrepiece of the legislation is the emphasis on the moral assessment to be made by the jury as to whether murder should be reduced to manslaughter in the light of any proven substantial impairment. Some may ask whether this new defence would have led to a conviction for murder rather than manslaughter in Mr Cassell's case. That is a hypothetical and somewhat improper question. Mr Cassell has been lawfully convicted under the present legislation and is serving his sentence. What I can say is that the new defence places increased emphasis on the role of the jury as the appropriate body to assess guilt or innocence when the defence is raised. The new defence also places increased emphasis on the moral assessment by the jury as to whether the evidence warrants the reduction from murder to manslaughter.
...
I turn now to a detailed analysis of the provisions of the bill. Item [1] of schedule 1 repeals the present section 23A of the Crimes Act 1900 and inserts a new section 23A. The new section 23A(1)(a) requires the accused person to prove that his or her capacity to understand events, to judge whether his or her actions were right or wrong, or to control himself or herself was substantially impaired by an abnormality of mind arising from an underlying condition. The reference to 'substantially impaired' in proposed new section 23A(1)(a) excludes trivial impairments. The term 'abnormality of the mind' has a restricted meaning in the context of this amendment. Everyone would agree that a person who kills another person is acting abnormally. However, a person charged with murder cannot come within the defence unless they prove that the abnormality of mind affected his or her capacity to understand events, to judge whether his or her actions were right or wrong, or to control himself or herself.
'Underlying condition' is defined as a pre-existing mental or physiological condition other than of a transitory kind. Proposed new section 23A(1)(b) is the centrepiece of the new defence. It returns the jury to the central position of assessing the culpability of the accused person. Under the old defence of diminished responsibility, some commentators felt that the opinions of the expert witnesses - that is, the psychiatrists and psychologists - dominated the jury's decision as to whether or not the defence succeeded. The new defence returns the jury to the central role by requiring the jury to determine whether the impairment, once established, was so substantial as to warrant liability for murder being reduced to manslaughter. In coming to its verdict, the jury brings to bear the community's collective wisdom and its sense of justice.
Proposed new section 23A(2) emphasises community values. It does this by preventing expert witnesses from giving an opinion as to whether the impairment was so substantial as to warrant liability for murder being reduced to manslaughter. The experts will only be able to give evidence about whether there was a substantial impairment under proposed new section 23A(1)(a). I will be reinforcing the important role of the jury set out in proposed new section 23A(1) by asking the Director of Public Prosecutions to amend his prosecution guidelines to require prosecutors to take community values into consideration when deciding whether to consent to a trial by judge alone when the accused is charged with murder and has given notice that he or she will rely upon the defence of substantial impairment, and whether to accept a plea to manslaughter on the basis of substantial impairment when the person has been charged with murder.
I accept that this emphasis on the role of the jury may lead to more trials and therefore greater costs to the courts, the Director of Public Prosecutions, defence agencies and the accused. In determining the guilt or innocence of a person for murder or manslaughter, however, costs should not be the only consideration.
...
In conclusion, the bill introduces half a dozen new measures. The amendments emphasise the role of the jury. They give the experts concrete tests by which to assess the impairment of the accused. They do not permit the experts to give evidence about the ultimate moral assessment which the jury must make."
23The Crown contended in this case that the issue was definitively one that required the assessment and application of objective community standards and as such was one that fell squarely within the purview of a properly instructed jury. I was in that respect referred to the decisions of Hunt CJ at CL in R v Trotter (1993) NSWLR 428 at 431E-G and Adams J in R v Majdalawi [2000] NSWCCA 240 at [36]. The Crown also contended that there were no other factors or issues tending to suggest that it was in the interests of justice to make the order sought.