Ministerial discretion to cancel a visa on character grounds must be exercised according to statutory criteria and is subject to judicial review for legal error.
immigration
Executive detention of non-citizens is only lawful where removal is reasonably practicable; indefinite detention where removal is not possible is constitutionally invalid, effectively overruling Al-Kateb.
HCA considered s 80 Constitution guarantee of trial by jury and the Kable principle as they apply to territory courts and territory criminal proceedings.
Implausibility findings in refugee assessments may constitute jurisdictional error where they are based on illogical or unreasonable reasoning amounting to Wednesbury unreasonableness.
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