Summary Offences Act 1953

In any proceedings under this Part, the court determining the proceedings—

must, on the application of the Commissioner, take steps to maintain the confidentiality of information classified by the Commissioner as criminal intelligence, including steps to receive evidence and hear argument about the information in private in the absence of the parties to the proceedings and their representatives; and

may take evidence consisting of, or relating to, information that is so classified by the Commissioner by way of affidavit of a police officer of or above the rank of superintendent.