Reports of the WA Corruption and Crime Commission, being investigative opinions with no operative legal effect, are not to be scrutinised on judicial review as if they were reasons for decision of a determinative tribunal. The standard for establishing jurisdictional error in CCC misconduct findings requires showing that no reasonable person could have reached the CCC's conclusion. The CCC is not required to take into account a public officer's work history when forming opinions about specific instances of misconduct. Certiorari is not available to quash CCC reports, but declaratory relief may be granted where the report injures reputation.
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