CRIMES ACT 1914 SECT 3ZQD

If a person who has given consent to the carrying out of a prescribed procedure expressly withdraws consent to the carrying out of that procedure (or if the withdrawal of such consent can reasonably be inferred from the person's conduct) before or during the carrying out of the procedure, the carrying out of the procedure is not to proceed otherwise than by order of a magistrate on the application of an investigating official.