An order of a superior court made in the exercise of a function that is incompatible with judicial power (as characterised by the High Court in Kable v DPP) is not a judicial order and does not enjoy the presumption of validity that attaches to judicial orders of superior courts of record. Such an order is void ab initio and provides no lawful justification for detention. The State is vicariously liable under the Law Reform (Vicarious Liability) Act 1983 (NSW) for false imprisonment carried out by its officers pursuant to such an order, regardless of any statutory protection available to the officers personally. The commencement of proceedings under legislation later held unconstitutional does not, without more, constitute malice or improper purpose for the torts of malicious prosecution or collateral abuse of process.
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