The ratio between head sentence and non-parole period commonly found for lesser offences (60-75%) is generally inappropriate for murder and other very serious crimes attracting high head sentences, as it would create inordinately long parole periods; a non-parole period in excess of 80% of the head sentence is not unusual for murder. Arguments abandoned or eschewed on the plea will not be entertained on appeal unless fresh evidence is adduced or most compelling material demonstrates a miscarriage of justice. Cogent evidence, normally expert opinion, is required to enliven Verdins principles for intellectual disability — a logical hypothesis from the Bar table is insufficient.
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