When the AAT reviews a deportation decision concerning an established resident, natural justice requires that conduct relied upon to justify deportation must be established on the balance of probability by logically probative evidence, not merely raised as suspicion or speculation. The AAT's duty to observe natural justice extends not only to procedural steps but to the material upon which the decision itself is based. Statements by the AAT President about general approaches to evidence assessment may constitute administrative practice guidance rather than binding legal principles, and are not necessarily amenable to appeal on a question of law.
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