R v Watson; Ex parte Armstrong

The High Court of Australia considered an application for a writ of prohibition brought by Armstrong against Watson, a magistrate. The dispute concerned the validity of a search warrant issued by Watson under the provisions of the *Crimes Act 1914* (Cth). Armstrong sought to prohibit the use of evidence obtained pursuant to that warrant in proceedings against him.

The central legal issue before the Court was whether the search warrant had been validly issued. Specifically, the Court had to determine if the information laid before the magistrate was sufficient to satisfy the requirements of section 3 of the *Crimes Act 1914* (Cth), which stipulated that a justice of the peace might issue a search warrant if satisfied by information on oath that there was reasonable ground for suspecting that an offence against the laws of the Commonwealth had been, or was suspected of having been, committed.

The Court reasoned that the information laid before the magistrate was deficient because it did not disclose sufficient grounds for the magistrate to be satisfied of the existence of reasonable suspicion. The information merely stated that the applicant was suspected of having committed certain offences, without providing any factual basis for that suspicion. The Court held that the magistrate must be furnished with facts and circumstances from which he could himself infer the existence of reasonable suspicion, rather than being asked to accept the suspicion of the informant as sufficient. Consequently, the search warrant was invalid.

The High Court made absolute the order nisi for a writ of prohibition.