Denial of procedural fairness
16 There is a substantial body of authority concerned with the situation in which an administrative decision-maker becomes aware of information bearing on the decision, which is not made known to a party to whom the decision is unfavourable. In such cases, courts will not accept readily the statement by the decision-maker that the unrevealed information played no part in the decision. The rationale for this rule is the concern with due process. The risk of unconscious prejudice against the losing party is considered to be so great that, in general, courts will say that the information should have been revealed to the losing party, so as to provide an opportunity to respond to it, or the decision should have been made by someone unaware of the unrevealed information.
17 The rule was summarised by Brennan J in Kioa v West (1985) 159 CLR 550 at 629 as follows:
'Nevertheless in the ordinary case where no problem of confidentiality arises an opportunity should be given to deal with adverse information that is credible, relevant and significant to the decision to be made. It is not sufficient for the repository of the power to endeavour to shut information of that kind out of his mind and to reach a decision without reference to it. Information of that kind creates a real risk of prejudice, albeit subconscious, and it is unfair to deny a person whose interests are likely to be affected by the decision an opportunity to deal with the information. He will be neither consoled nor assured to be told that the prejudicial information was left out of account.'
18 At [21], the primary judge referred to this statement of the law by Brennan J. At [22] - [24], his Honour also relied on: Youssef v Minister for Immigration & Ethnic Affairs (1987) 14 ALD 550 at 552; Roderick v Australian and Overseas Telecommunications Corporation Ltd (1992) 39 FCR 134 at 145 per Hill J, with whom Keely and O'Loughlin JJ agreed; and NIB Health Funds Ltd v Private Health Insurance Administration Council [2002] FCA 40 (2002) 115 FCR 561 at [94]. At [30], his Honour referred to R v Gaming Board for Great Britain; Ex parte Benaim and Khaida [1970] 2 QB 417 at 431 per Lord Denning MR. To that list of citations might be added the line of authority relating to disciplinary tribunals in the Australian Public Service, to which it was apparently the practice to send the whole file relating to the public servant concerned, even if it contained prejudicial material extraneous to the matter at hand. See Hercules v Jacobs (1982) 60 FLR 82, Phillips v Secretary, Department of Immigration and Ethnic Affairs (1994) 48 FCR 57, Day v Douglas [1999] FCA 1444 at [45], Commonwealth of Australia v Day [2000] FCA 474 at [22] - [24] and Bohills v Friedman [2001] FCA 569 (2001) 110 FCR 338 at [20] - [31]. In each of those cases, the Court emphasised the importance of the decision-maker not seeing the prejudicial material when the credibility of the party to whom it is prejudicial is crucial to the decision. It should be noted that the public service disciplinary tribunal cases were concerned with tribunals in which the presiding officer was required to be an experienced lawyer, although the other two members of the tribunal were likely to be lay persons.
19 There are cases in which courts have taken the view that no harm was done by the unrevealed prejudicial material, because the decision-maker concerned was considered to be well able to put the material out of consideration, as a judge is generally expected to do. Madafferi v Minister for Immigration and Multicultural Affairs [2000] FCA 158 and Hall v Release on Licence Board (unreported, New South Wales Court of Appeal, 27 June 1989) are examples, but they are rare. Madafferi concerned a deputy president of the Administrative Appeals Tribunal, an office for which s 7(1A) of the Administrative Appeals Tribunal Act 1975 (Cth) requires the same qualification as is required by s 6(2) of the Federal Court of Australia Act 1976 (Cth) for appointment as a judge of this Court. It was by no means clear that the material concerned was irrelevant to the issues before the deputy president. Because the argument was about whether the deputy president should disqualify himself in advance of the hearing, by reason of apprehended bias as a result of seeing the prejudicial material, it was not then clear to what extent, if any, the credit of Mr Madafferi bore on the issues in the case. Hall concerned a board the chair of which was a person of long judicial experience, entrusted with the task of considering whether prisoners should be released early on licence, and therefore accustomed to assessing the relative significance of items of information relating to the past conduct of those prisoners. The issue was whether the board was disqualified by reason of having seen the full file of the Department of Corrective Services, which had not been supplied to the solicitor acting for the prisoner. The file contained details of charges pending against the prisoner. It was clear that the board was able to separate those pending charges from the breaches of licence conditions with which its deliberations were concerned. The credit of the prisoner does not appear to have been in issue.
20 The Tribunal that decided the respondent's case consisted of one member. So far as I have been able to ascertain, the Migration Act lays down no minimum qualifications for appointment as a member of the Tribunal. Although some members of the Tribunal are lawyers, most are not. It is unnecessary for any of them to have the same qualifications as are required for appointment as a judge of a court. There is no requirement for experience, such that it might be possible to say that members might have had to engage in the task of sifting relevant from irrelevant material and having regard only to the former in making decisions. The Tribunal is not bound by the rules of evidence. Its members do not have the opportunity to do what judges do frequently, to look at the content of evidence for the purpose of ruling on its admissibility and then to disregard it for all purposes if it is inadmissible. These considerations suggest that the principle emerging from the cases to which I have referred in [17] and [18] ought to be applied to the Tribunal's conduct of its proceedings with a degree of strictness. Caution is required, to ensure that systems of administrative decision-making are to be fair.
21 Based as it is on a fundamental principle, namely the requirement that procedural fairness not only be afforded, but be seen to be afforded to an unsuccessful party, the body of authority to which I have referred in [17] and [18] should not be set aside lightly. In my view, it is wrong to undermine the principle by close distinctions on the facts of particular cases. Nor do I think that the principle should be undermined by treating Brennan J's formulation of it as if it were a statute, and seeking to construe closely what his Honour meant by 'credible, relevant and significant to the decision to be made.' As to the word 'credible', I am of the view that all that is required is that the information should not lack credibility either on its face, or by reason of the circumstances in which it came to the notice of the decision-maker. I am far from convinced that a rule should be developed that regards as credible only those documents emanating from official sources. Still less would I favour a rule that treats all documents emanating from official sources as automatically credible. The threshold of credibility intended is a low one. It is intended to exclude only those kinds of information that would necessarily be dismissed out of hand.
22 In my view, the primary judge in the present case was correct to regard the letter as 'credible, relevant and significant to the decision to be made', within the formulation of the principle as expressed by Brennan J. As his Honour found at [25] of his reasons for judgment, the Tribunal did not dismiss the letter out of hand. The Tribunal expressly regarded the allegations in the letter as possibly having weight, if it had been in a position to test them. The fact that the letter was written by a person who claimed to have a personal association with the respondent and to be in a position to provide the information contained, including information said to have been provided by the respondent, was a powerful reason for regarding the letter as 'credible'.
23 The primary judge was also correct at [26] of his reasons for judgment, in finding that the information was relevant and significant to the decision. His Honour described the allegations about the respondent's activities in Australia as 'highly derogatory of him and ... clearly prejudicial to his claim'. As his Honour said, the credibility of the respondent was central to the Tribunal's decision. The tenor of the letter was such as to undermine that credibility. If the case had not been one in which the credibility of the respondent played an important part, it would have been easier to accept the Tribunal's disclaimer that the material in the letter had affected its decision. In the circumstances, it is more than possible that the Tribunal's assessment of the credibility of the respondent was influenced, even subconsciously, by the material in the letter. I do not accept that evidence is necessary before a decision-maker's disclaimer is to be ignored in circumstances such as these.
24 The reasons given by the Tribunal for making the direction pursuant to s 440(1) leave me far from satisfied that the Tribunal member dealt with the letter appropriately. It was one thing for the Tribunal member to suggest that the contents of the letter should not be published or disclosed because they were communicated in confidence, although exactly how it was intended that the 'advice' to keep the 'information secret' in a letter addressed, 'To Whom it May Concern', is not entirely clear. It is another thing to say that the contents of the letter should be known to the Tribunal member who made the decision, but concealed entirely from the respondent. In my view, the primary judge was correct to hold that, in the circumstances, the respondent was denied procedural fairness. In order to ensure that procedural fairness was afforded to him, it was necessary that he be given an opportunity to respond to the substance of the allegations in the letter, or that the case be determined by another Tribunal member who had not seen the letter.