Section 75(3) of the Correctional Services Act 1982 (SA) imposes a mandatory requirement that time spent in custody after committing an offence while on parole be counted towards the unexpired balance of the previous sentence, and the sentencing court must backdate the commencement of the sentence accordingly. When imposing cumulative sentences, a sentencing judge must not deduct time served from the aggregate of sentences in a manner that eliminates separately identifiable sentences for each group of offences. The totality principle must be applied to head sentences, not merely to the non-parole period, when cumulative sentences are imposed.
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