12 In Cornwell v R (2007) 231 CLR 260 the High Court had to consider whether a certificate should have been granted to an accused who was asked questions in chief about conversations he had with a third person. The issue revolved around the interpretation of s 128(8), but at [106] - [113] the majority of the Court (Gleeson CJ, Gummow, Heydon and Crennan JJ) said:
"[106] Finally, one other aspect of s 128 may be referred to. The opening words of s 128(1) provide that s 128 only applies if "a witness objects to giving particular evidence". A fair characterisation of the exchanges between counsel for the accused and Howie J set out earlier [104] is that while in one sense the accused "objected" to the thirty-fifth question he was asked in chief when he claimed privilege, in another sense he did not object at all. He evidently wanted to give some evidence about the Diez-Lawrence conversations. He could only be sure of giving it in the way he would have liked if he gave it in chief; if he took the risk of leaving its reception to the chance of particular questions in cross-examination, he ran the risk of not being able to give it, or not in the way perceived to be most favourable to his interests. Hence his claim of privilege was arguably not a means by which he "objected", but was an attempt to ensure that s 128 protected him from some potentially adverse consequences of evidence which he did not "object" to giving, but strongly wanted to give.
[107] The accuracy of that characterisation is supported by the following factors.
[108] First, counsel for the accused carefully spent time in the days preceding 5 May 2003 seeking to prepare the ground for a favourable ruling on the evidence. He had hopes of a favourable ruling before the accused's case opened. While Howie J was resistant to blandishments seeking a favourable ruling, the course being charted for the accused was plainly driven by the desire of the accused to give evidence in chief about the Diez-Lawrence conversations.
[109] Secondly, the thirty-fourth question was leading and the thirty-fifth question explicitly triggered the claim to privilege which the accused made: what was happening was no surprise to the accused.
[110] Thirdly, if the accused had objected to counsel's question in the sense of not wanting to answer it, or not wanting it to be asked, the issue probably would have been sorted out before the accused entered the witness box, or the accused could have reacted in such a way as to cause counsel to withdraw the question. The fact that the thirty-fifth question, and all the later questions in chief about the Diez-Lawrence conversations, were asked supports the conclusion that the accused wanted to give evidence about them and instructed counsel to structure events so that he could do so with a measure of impunity.
[111] This characterisation raises a question whether s 128(1), and hence s 128 as a whole, applies where a witness sets out to adduce in chief evidence revealing the commission of criminal offences other than the one charged. A criminal defendant might wish to present an alibi, the full details of which would reveal the commission of another crime. A civil defendant might wish to prove the extent of past earnings, being earnings derived from criminal conduct. This raises a question whether witnesses who are eager to reveal some criminal conduct in chief, because it is thought the sting will be removed under sympathetic handling from their own counsel or for some other reason, are to be treated in the same way as witnesses who, after objection based on genuine reluctance, give evidence in cross-examination about some crime connected with the facts about which evidence is given in chief.
[112] The view that the accused's claim of privilege in all the circumstances answered the requirements of s 128(1) has difficulties. It strains the word "objects" in s 128(1). It also strains the word "require" in s 128(5) - for how can it be said that a defendant-witness is being "required" to give some evidence when his counsel has laid the ground for manoeuvres to ensure that the defendant-witness's desire to give the evidence is fulfilled? And it does not fit well with the history of s 128(8). For one thing, s 1(e) of the 1898 Act and its Australian equivalents provided that an accused person called pursuant to the legislation could be "asked any question in cross-examination notwithstanding that it would tend to criminate him as to the offence charged", which implies that the protection of the accused's position in chief or in re-examination was a matter between the witness's counsel and the witness. For another thing, the Australian Law Reform Commission, in summarising the pre-s 128(8) law, assumed that s 1(e) and its Australian equivalents were to be construed as applying to questions in cross-examination only.
[113] The present point was not raised by the DPP either in the courts below or in this Court. It was raised by this Court in the course of oral argument, but was not embraced by counsel for the DPP. "Sometimes this Court will decide a question which has not been referred to or discussed by an intermediate court of appeal but that is not the course which should ordinarily be followed." The present question could be of considerable importance in the day-to-day conduct of trials, since counsel for the accused submitted that in practice s 128 was often employed by prosecutors to elicit evidence in chief. It is not necessary finally to decide this issue, since the appeal is to be allowed on other grounds. And it is not desirable to do so in view of the absence of dispute between the parties on the question and the importance of the question."
13 It is clear that the majority were not determining the matter but the observations by the majority in Cornwell introduce a complication to the present task, as, in my view, although not binding, they point strongly to the reasoning adopted in Ferrall as being unsound, and I remain doubtful as to whether s 128 was intended to protect plaintiffs or defendants who positively wish to assert facts in their oral evidence in chief, or a fortiori in affidavits, which would incriminate them. I take into account, however: