Ex parte Spencer

In *Ex parte Spencer*, the applicant sought a writ of habeas corpus to challenge his conviction under section 19 of the *Games, Wagers and Betting Houses Act 1902* (NSW). The applicant had been found in a gaming house and charged with assisting in conducting its business. The central dispute concerned the validity of a previous conviction for being found in a gaming house without lawful excuse, which the applicant argued should have estopped the subsequent prosecution under the doctrine of *autrefois convict*. The matter came before the High Court of Australia, comprising Griffith CJ, Barton and O'Connor JJ.

The primary legal issue before the High Court was to determine the correct test to apply when a plea of *autrefois convict* is raised. Specifically, the court had to consider whether the offence for which the applicant had previously been convicted was the same as, or substantially the same as, the offence for which he was subsequently prosecuted, such that the prior conviction should bar the second prosecution.

The court reasoned that the test for *autrefois convict* requires an examination of the essential elements of both offences. It was held that the previous conviction for being found in a gaming house without lawful excuse did not preclude the subsequent prosecution for assisting in conducting the business of such a house. This was because the latter offence required proof of a different and more substantial element – active participation in the management or operation of the gaming house – which was not an ingredient of the former offence. The court applied the principle that for *autrefois convict* to succeed, the facts constituting the second offence must be identical to, or be a necessary consequence of, the facts constituting the first offence.

The High Court dismissed the application for a writ of habeas corpus, upholding the validity of the second conviction.