A sentencing judge may infer from the quantity and value of drugs that an offender was at the higher end of a drug trafficking hierarchy and expected to make a substantial profit, as matters of known human behaviour, without requiring direct evidence of those matters. Section 12 of the Sentencing Act 2017 (SA) is available to South Australian courts sentencing Commonwealth offenders, as it constitutes a 'well-known and long-established procedure' within the meaning of Weininger v The Queen.
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