Section 78B of the Judiciary Act 1903 (Cth) does not require service of notices on Attorneys-General where the constitutional contention raised is plainly unarguable, because a cause does not 'involve' a matter arising under the Constitution merely because someone asserts that it does. A declared vexatious litigant who assists a vulnerable person to pursue meritless constitutional arguments may be engaging in conduct that amounts to an abuse of process, potentially warranting an application under s 10 of the Vexatious Proceedings Act 2005 (Qld).
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