Ground 3
44 In its reasons at [75] the Tribunal said:
The Applicant told the Tribunal that has [sic] been receiving injections for his drug dependence and has not used drugs for two years. He claims that drugs are available in jails and in Villawood. While that may be the case, the Tribunal does not consider that drugs are as readily available in detention as they are in the community. Thus, the Applicant's abstinence from drugs during his incarceration cannot, in the Tribunal's view, evidence his ability to abstain from drug use when living in the community.
(Emphasis added.)
45 Ground 3 focuses on the italicised sentence. It is argued that there was no evidence before the Tribunal that drugs are any less available in detention than in the community generally.
46 The applicant sought to rely on an affidavit annexing media reports which purport to show that some drugs are in fact readily available in immigration detention. That material was not before the Tribunal; and, in any event, evidence to the contrary of an asserted fact does not prove that there was no evidence for that fact. Counsel for the applicant accepted that this evidence could only show the nature of the material the Tribunal might have found if it had investigated the issue. However, it is not contended that the Tribunal erred by failing to make an inquiry. I therefore regard this evidence as irrelevant.
47 The Tribunal was dealing with a claim by the applicant that he had not used drugs for two years in an environment in which they were available. It was necessary for the Tribunal to consider (as it did in the last sentence of the paragraph) whether that was a useful predictor of the applicant's ability to abstain from drug use if released into the community. To accept that it was a useful predictor, the Tribunal needed to be satisfied that the applicant's abstinence was not explained by the conditions in detention. This was the context in which the Tribunal said that it "does not consider" that drugs were as available in detention as in the community. For this reason, the Tribunal's statement is properly understood as expressing a lack of satisfaction that the applicant had made out a necessary step in his argument, rather than a positive finding about the availability of drugs in detention. The Tribunal did not need to point to specific evidence to justify that lack of satisfaction.
48 For this reason, ground 3 must be rejected.
49 If (contrary to my view) the observation to which ground 3 relates constituted a positive finding, it was a cautious one: it was not that drugs are unavailable or rarely available in detention, but that they are not "as readily available" in that setting "as they are in the community".
50 In considering whether the Tribunal had a proper basis for a finding in those terms it is important to bear in mind that, in administrative decision making, the nature of the material that can be relied upon in reaching a decision is not as strict as in a proceeding before a court; and, indeed, inferences may sometimes be drawn from an absence of evidence. Relevantly in L & B Linings Pty Ltd v WorkCover Authority of New South Wales [2012] NSWCA 15 at [33]-[34] Basten JA (with whom McColl and Whealy JJA agreed) said:
The respondent relied upon the discussion of the "no evidence" ground, under the general law, in the judgment of Mason CJ in Australian Broadcasting Tribunal v Bond. Mason CJ noted that there was "no error of law simply in making a wrong finding of fact" - referring to Waterford v The Commonwealth; noting that "want of logic is not synonymous with error of law", he continued:
"So long as there is some basis for an inference - in other words, the particular inference is reasonably open - even if that inference appears to have been drawn as a result of illogical reasoning, there is no place for judicial review because no error of law has taken place."
Four points of caution should be made. First, this passage indicates that the "no evidence" ground of judicial review depends not on the reasoning of the decision-maker, but on a comparison between the material available to the decision-maker and the conclusion reached. Secondly, care must be taken with the term "no evidence", as an administrative decision-maker is usually entitled to take into account material which would not count as "evidence" in a judicial context. In what is essentially an inquisitorial inquiry, that material is not necessarily limited to the material placed before the decision-maker by the applicant for review. Thirdly, it is important to bear in mind that the decision-maker may be entitled to seek support for a particular inference from the absence of material supportive of a contrary view. Fourthly, where an evaluative judgment is to be formed on the basis of conflicting indicators, it will be difficult if not impossible to establish a "no evidence" ground of review.
(Citations omitted, emphasis in original.)
51 In the present case the Tribunal heard the applicant's review application in its General Division, subject to the provisions of the Administrative Appeals Tribunal Act 1975 (Cth) (the AAT Act) rather than under Part 5 or Part 7 of the Migration Act. It thus proceeded according to an adversarial procedure, with the Minister as a party and both parties represented (under ss 30 and 32 of the AAT Act), so that the label "inquisitorial" would for some purposes not be apt. However, it was not bound by the rules of evidence and was entitled to inform itself in whatever manner it thought appropriate (s 33(1)(c) of the AAT Act).
52 In that setting, it was not erroneous for the Tribunal to proceed on the understanding that the applicant was living in an environment where his movements and the people he could associate with were heavily regulated. It is also uncontroversial that people in immigration detention are subject to a much greater level of surveillance and monitoring than people in the community generally. Of course these considerations do not exclude the possibility of drugs, potentially in significant quantities, being brought into detention centres and becoming available to detainees. However, absent evidence of the extent to which that occurs, it was reasonable to infer that sources of supply are more limited, and the prospects of detection greater, than for people at liberty in the community. To the extent that the Tribunal made a finding that drugs were less "readily available" in detention than in the community, that finding had a rational basis.
53 The Minister also referred to Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs v Viane [2021] HCA 41; 96 ALJR 13 at [18] (Viane), where it was said that "[in] the circumstances of the present case, where no evidence or other material has been identified in support of the Minister's findings … it can be assumed that the findings proceeded from the Minister's personal or specialised knowledge or were matters commonly known". Viane concerned a decision under s 501CA(4) made by the Minister personally, where there were "no limitations on the sources of information that may be considered", and no requirement that the Minister disclose whether a material finding was made from personal knowledge.
54 I have expressed the view above that it was open to the Tribunal to rely on the obvious, widely known and uncontradicted understanding that the applicant's liberty was constrained in detention and his capacity to obtain a commodity (especially one whose sale and use are prohibited) was probably therefore also constrained. However, I do not think it would be appropriate in the circumstances of the present case to assume that the relevant finding (if one was made) proceeded from "personal or specialised knowledge" of circumstances in detention. Unlike the Minister in Viane, the Tribunal was proceeding in an adversarial framework that called for a form of procedural fairness not far removed from that expected in a court. Although it was open to the Tribunal (in the light of s 33(1)(c) of the AAT Act) to take into account the presiding member's own knowledge of facts relevant to the issues before it, the Tribunal would have invited complaint (at least) if it had relied on its private understanding of things that were not common knowledge without having disclosed that understanding to the parties and invited their response. The absence of any evidence of such disclosure makes it unlikely that the Tribunal was relying on any specialised body of knowledge.