Hammond v State of New South Wales

Hammond (the appellant) sought an extension of time and leave to appeal against a decision of the Supreme Court of New South Wales, which had summarily dismissed his summons. The core of the dispute concerned whether Hammond had disclosed an arguable cause of action, and whether his proceedings constituted a collateral attack on prior judicial decisions, thereby engaging the principles of *res judicata* and issue estoppel.

The Court of Appeal was required to determine whether the Supreme Court had erred in summarily dismissing the summons. This involved assessing whether Hammond's claim presented a legally arguable case, or if it was an impermissible attempt to relitigate issues already determined by the courts, thus being an abuse of process.

The Court found that Hammond's proceedings were an attempt to challenge the validity of previous judgments and orders made by the courts. It held that the principles of *res judicata* and issue estoppel prevented the relitigation of matters that had been, or could have been, litigated in prior proceedings between the same parties. Consequently, the Court concluded that Hammond's summons did not disclose an arguable cause of action and constituted an abuse of process.

The summons seeking an extension of time and leave to appeal was dismissed with costs.