In judicial review of a decision not to revoke mandatory visa cancellation under s 501CA(4) of the Migration Act, the Tribunal's assessment of recidivism risk and the weight it affords to opinion evidence on that question are matters within its discretion, provided its reasoning remains within the bounds of rationality, and a criminologist's evidence on recidivism risk may rationally be afforded little weight where the witness had limited contact with the applicant, did not engage with the evidence tendered, and acted as an advocate.
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