Criminal Code Act 1899

A person who executes or assists in executing any sentence, process, or warrant, which purports to be passed or issued by a court, justice, or other person, and who would be justified, under the provisions of sections 247 to 250, in executing the same if it had been passed or issued by a court, justice, or person having authority to pass or issue it, is not criminally responsible for any act done in such execution, notwithstanding that the court, justice, or person, had no authority to pass the sentence or issue the process or warrant, if in such execution the person acted in good faith and in the belief that the sentence, process, or warrant, was that of a court, justice, or other person, having such authority.