Section 87 of the Sentencing Act 1995 (WA) does not require that an offender be in custody solely for the offence being sentenced; credit must be given where the time in custody cannot be attributed to other offences for which credit has already been given, and it is just to do so. A sentencing judge should order parole eligibility for a young offender even with a poor compliance history, where the offender has substance abuse issues requiring supervision and the community interest favours encouraging rehabilitation.
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