335 S 106 of the Act permits the calling of evidence that would have the effect of discrediting a witness, in the several ways provided. Subsection (d) of that section, which provides an exception in relation to evidence that tends to prove that a witness "is, or was, unable to be aware of matters to which his or her evidence relates", has been interpreted broadly, as extending to many aspects of reliability or credibility, including psychological, psychiatric, or neurological considerations.
336 In R v Souleyman NSWSC Levine J, 5 September 1996 evidence was admitted in the form of a psychiatric report to show that a witness was histrionic and dependant, and prone to lying, on the basis that it tended to prove that the witness would neither know the truth nor want to know the truth.
337 The section would also permit the calling of evidence of the kind Lord Pearce spoke of in Toohey, from an ophthalmologist (oculist) concerning the short-sightedness of a witness, where that would be relevant to an acceptance of his testimony, that is, provided the substance of the evidence to be called had been put to the witness and denied.
338 Section 108 of the Evidence Act, which is concerned with re-establishing credibility provides:
Exception: re-establishing credibility
108 (1) The credibility rule does not apply to evidence adduced in re-examination of a witness.
339 The remaining provisions are of no relevance, being concerned with the admissibility of prior consistent statements. The section, accordingly, has a more restricted application than s 106, and tends to reflect the common law rule that prevented evidence being called in a party's case that might tend to bolster the credit of a witness called by that party (R v Turner [1975] QB 834 at 842). The provision broadly accords with the common law rule, which permitted re-examination that was directed towards explaining away or qualifying facts elicited in cross-examination, which were prejudicial to the witness's credit, or from which prejudicial inferences could be drawn: Wentworth v Rogers (No 10) (1987) 8 NSWLR 398.
340 The ambit of permissible re-examination is set by s 39 of the Act which provides:
39 On re-examination:
(a) a witness may be questioned about matters arising out of evidence given by the witness in cross-examination; and
(b) other questions may not be put to the witness unless the court gives leave.
341 A serious question does arise, in these circumstances, whether the fresh evidence would have been excluded under s 102 of the Evidence Act, as not falling within any of the exceptions to the credibility rule, at least so far as that section relates to evidence that was designed solely to re-establish the credibility of a witness, including an accused.
342 Arguably, it could have been received at trial, or at a re-trial, if it was tendered as evidence that additionally went to the appellant's mental element (Adam), which was one of the essential elements for the offence charged.
343 Further, depending upon the nature of the cross-examination, the existence of the tumour might have been ventilated in the re-examination of the appellant (s 108(1)). Any such evidence would almost certainly have had to be limited to the existence of the tumour, and to its effects upon the appellant, as he perceived them. Such re-examination would not, in our view, have permitted the accused to give, for example, hearsay evidence as to the content of the expert opinions of Drs Teo and Langeluddecke.
344 Otherwise, it could only be received if Toohey, which was concerned with the reliability of a prosecution witness, can be seen as creating an exception to the credibility rule or as dealing with an aspect of reliability that falls outside that rule, which would then allow an accused to bolster the credibility of himself (or of a witness called in his case), by placing before the jury any psychiatric, neurological or similar conditions which may have given the jury a distorted impression of his evidence.
345 We do not consider it necessary to finally determine this latter point, for the reason that we are unpersuaded, even assuming the evidence to have been admissible, and to have been available at the close of the case for the accused, that it would have established, in accordance with the tests previously mentioned, a miscarriage of justice.
346 In that regard, a reading of the transcript does not suggest that the appellant's answers, either in chief or in cross-examination, were necessarily inappropriate or non-responsive. In chief he provided a comprehensive account of his background, including his activities as a stock broker, as a very active share trader, as a manager of funds, as the author of the Rivkin Report, and as the founder and Chairman of Directors of Rivkin Financial Services Limited, as well as an explanation of the operations of that company and its subsidiaries. He acknowledged an awareness of the insider trading laws, and he gave precise answers in chief to the questions put to him in relation to his telephone conversation with Mr McGowan.
347 He confirmed and gave precise and clear evidence concerning his recollection of having read the article "Impulse Tops Up Reserve Tank" on the morning of 23 April 2001, its impact upon him, and his reaction to Mr McGowan's phone call, to the effect that he had not believed a word of what he had said.
348 He similarly recalled, and gave clear and precise evidence in relation to the circumstances that led to the acquisition of the Qantas shares on the afternoon of 24 April when, according to him, Mr Kerstens had phoned him and recommended a purchase of 50,000 shares. He similarly gave a clear and precise account of the circumstances that led to the sale of these shares and of a short sale that he also made. In that context he gave a perfectly rational explanation of the practice of short selling. He provided an equally rational explanation in relation to price sensitivity and the importance of market perceptions of a deal for that sensitivity.
349 In cross-examination it appears to us that he did not behave with any lesser degree of clarity, rationality, or judgment in relation to the answers that he gave concerning the implications of an option or conditional contract to buy real estate.
350 It is true that, at times, he revealed some irritation with the cross-examiner related to repeated questioning on the same topic. On our reading of the transcript there was a degree of justification on his part, in that the cross examination was not particularly economical, or always relevant to the critical issue in the trial. It did tend to be somewhat repetitive and imprecise, particularly on the second day. However, when the cross-examiner focused, for example, on the proposition that the appellant had wanted to speak to McGowan directly to "find out precisely what this business deal [was] that he regarded as… a reason for [him] to accept an offer [for the house] which was conditional", he replied with an emphatic negative.
351 He accepted, frankly, and without any qualification of significance, an awareness of the public information, which had been released in relation to Qantas, of the fierce competition that had existed between the various carriers in the lead up to April 2001, and of the slump in Qantas' share price that he had seen on the screens. He also accepted, without argument, that his assessment in the Rivkin report of 23 April 2001 had been that the "situation in the Australian airline industry is a mess", that he could not and would not attempt to guess what might happen "in the short term", but that "taking a long term view, the stock was cheap".
352 When pressed as to whether he had one view which he used when investing for himself, and another view which he portrayed to subscribers to his newsletter, he agreed and explained, in a perfectly rational way, the different considerations which applied to a professional broker such as himself, and to lay investors.
353 In relation to the following otherwise insignificant exchange in the cross-examination, the appellant demonstrated his close attention to the questions being put, and his acuity of mind:
"Q. When was this conversation you had with Mr Dassakis?
A. I think it was on the phone after. That telephone call lasted, I think, about four and a half minutes, or five minutes, and 45 seconds of that was McGowan and the rest was Dassakis.
Q. You weren't timing your conversation with Mr McGowan, were you?
A. No, but I checked subsequently.
Q. Did Mr McGowan then hand the phone back to you and you had a conversation with Mr Dassakis, is that what you're saying?
A. To whom? He couldn't have handed it back to me because I wasn't in the room.
Q. I'm sorry. He handed the telephone back to Mr Dassakis and you had a telephone conversation?
A. Whether he handed it back or he handed it to the brother to hand back, I don't know the answer."