Castlemaine Tooheys Ltd v South Australia

Castlemaine Tooheys Ltd and others (the plaintiffs) challenged the validity of certain provisions of South Australia's Beverage Container Act 1975 and its amendments, as well as associated regulations and notices. The dispute centred on whether these South Australian laws unlawfully discriminated against interstate brewers by imposing restrictions on the distribution of beer in non-refillable bottles, thereby infringing upon the freedom of interstate trade and commerce guaranteed by section 92 of the Australian Constitution. The High Court of Australia was tasked with determining the constitutional validity of these provisions.

The primary legal issue before the High Court was whether the South Australian legislation, which effectively favoured locally brewed beer in refillable bottles over beer imported in non-refillable bottles, constituted an impermissible burden on interstate commerce under section 92 of the Constitution. The court had to consider whether any purported justifications for the legislation, such as environmental protection or energy conservation, were sufficient to overcome the discriminatory effect on interstate trade.

The High Court reasoned that section 92 of the Constitution requires that interstate trade, commerce, and intercourse be absolutely free. The court found that the South Australian legislation, by imposing a refund scheme and other requirements that disproportionately affected beer distributed in non-refillable bottles, created a barrier to interstate commerce. While acknowledging the state's legitimate interest in environmental protection, the court determined that the specific measures enacted were not reasonably adapted to achieving those objectives without unduly discriminating against interstate trade. Consequently, the court held that section 5 of the Beverage Container Act Amendment Act 1986, which inserted section 5b into the principal Act, was invalid to the extent of its purported insertion. Additionally, the notice published under section 5b and Regulation 7(d) of the Beverage Container Regulations 1976 were also found to be invalid.