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This book examines the policy and practice of the insanity clauses within the immigration controls of New Zealand and the Commonwealth of Australia. It reveals those charged with operating the legislation to be non-psychiatric gatekeepers who struggled to match its intent. Regardless of the evolution in language and the location at which a migrant’s mental suitability was assessed, those with ‘inherent mental defects’ and ‘transient insanity’ gained access to these regions.