In X v Australian Prudential Regulation Authority [2007] HCA 4 the High Court of Australia rejected a challenge to an APRA notice asking the appellants to show cause why they should not be disqualified from operating in Australia as not being fit and proper.

The notice was issued after evidence to the HIH Royal Commission by the appellants.

The appellants argued that the notice was a breach of the Royal Commissions Act which prohibits penalising witnesses. The High Court rejected that argument.