Lewis v Australian Capital Territory

In Lewis v Australian Capital Territory, the High Court of Australia considered an appeal concerning damages for false imprisonment. The appellant, Mr Lewis, had been sentenced to periodic detention but breached its conditions. Following an invalid decision by the Sentence Administration Board to cancel his periodic detention, Mr Lewis was unlawfully imprisoned in full-time detention for 82 days. He argued he was entitled to substantial compensatory damages for this period of unlawful imprisonment.

The central legal issue before the High Court was whether Mr Lewis was entitled to substantial compensatory damages for his false imprisonment, or if an award of nominal damages was appropriate. This required the Court to consider the nature of the tort of false imprisonment, the principles of causation and loss in the context of damages, and the availability of vindicatory damages. The Court also had to determine whether Mr Lewis's liberty was already qualified and attenuated due to his breaches of periodic detention, and whether his imprisonment would have lawfully occurred in any event.

The High Court reasoned that while Mr Lewis had indeed been falsely imprisoned due to the invalidity of the Sentence Administration Board's decision, he was not entitled to substantial compensatory damages. This was because, at the time of his unlawful imprisonment, Mr Lewis was already liable to be arrested without warrant and placed in full-time detention due to his breaches of periodic detention. The Court found that, but for the invalid cancellation of his periodic detention, he would have been lawfully imprisoned for the same period. Therefore, he suffered no actual loss of liberty that could be compensated by substantial damages. The Court also held that there was no basis for a new head of damages described as "vindicatory damages" under Australian common law.

The High Court dismissed the appeal with costs, upholding the award of nominal damages. This outcome affirmed that where a plaintiff's liberty would have been lawfully curtailed in any event, they are not entitled to substantial compensatory damages for a period of false imprisonment, even if that imprisonment was technically unlawful due to procedural defects.