ICAC's broad discretion under s 20 of the ICAC Act to determine whether to investigate complaints is subject to only limited judicial review for unreasonableness, and the nature of a decision not to investigate (as opposed to a determination of facts) makes the unreasonableness ground particularly difficult to establish. Courts exercising supervisory jurisdiction cannot order ICAC to investigate. Associations between judges and colleagues who acted as counsel in prior litigation involving a party do not give rise to a reasonable apprehension of bias.
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