Plumb v Tritton

The High Court of Australia heard an appeal from the Supreme Court of Queensland concerning a prosecution for selling adulterated gin. The complainant, an inspector under the Health Acts, alleged the defendant had exposed for sale gin that was below the regulation standard of strength. The inspector had taken a sample, divided it into two parts, given one to the defendant, and sent the other to the State analyst, whose evidence confirmed the adulteration. The defendant argued that the prosecution was invalid because the inspector had not divided the sample into three parts as required by section 104 of the Health Acts, and therefore section 111D, which allows for a further analysis of a retained sample, could not be invoked.

The legal issue before the High Court was whether compliance with sections 103 and 104 of the Health Acts, including the division of a sample into three parts and the potential for a further analysis under section 111D, was a mandatory prerequisite for a conviction for selling adulterated food under section 91. The Supreme Court of Queensland had held that these procedural requirements were conditions precedent to a valid conviction, leading to the quashing of the defendant's conviction.

The High Court reasoned that section 91, which prohibits the sale of adulterated food, establishes an offence that is prima facie provable by ordinary rules of evidence. While sections 103 and 104 provide a specific procedure for obtaining and analysing samples, and section 111D allows for a further analysis, these sections are not necessarily essential for proving an offence under section 91 in every instance. The Court found that the definition of "adulterated" in the Act was broad and encompassed many forms of adulteration that would not require analysis. Therefore, analysis, and consequently the strict adherence to sections 103, 104, and 111D, was not an essential mode of proof in every prosecution. The Court distinguished the powers under section 103 (compulsory sale and division into three parts) from those under section 102 (seizure and forfeiture), concluding that the procedural safeguards in sections 104 and 111D were ancillary to the powers exercised under section 103 and not universally applicable to all prosecutions for selling adulterated food.

The High Court allowed the appeal, discharged the rule nisi to quash the conviction, and restored the conviction and order of the Police Magistrate.