[208] In Australia, express malice for the purpose of defeating a common law qualified privilege is confined to "any improper motive or purpose that induces the defendant to use the occasion of qualified privilege to defame the plaintiff" (Roberts v Bass at 30). It is not to "be confused with the defendant's ill-will, knowledge of falsity, recklessness, lack of belief in the defamatory statement, bias, prejudice or any other motive than duty or interest for making the publication" (Roberts v Bass at 31). This does not mean, however, that each of these matters is irrelevant. Anyone of these matters, if proved, "usually provides a premise for inferring that the defendant was actuated by an improper motive in making the publication. Indeed, proof that the defendant knew that a defamatory statement made on an occasion of qualified privilege was untrue is ordinarily conclusive evidence that the publication was actuated by an improper motive. But, leaving aside the special case of knowledge of falsity, mere proof of the defendant's ill-will, prejudice, bias, recklessness, lack of belief in truth or improper motive is not sufficient to establish malice. The evidence or the publication must also show some ground for concluding that the ill-will, lack of belief in the truth of the publication, recklessness, bias, prejudice or other motive existed on the privileged occasion and actuated the publication. Even knowledge or a belief that the defamatory statement was false will not destroy the privilege, if the defendant was under a legal duty to make the communication. In such cases, the truth of the defamation is not a matter that concerns the defendant, and provides no ground for inferring that the publication was actuated by an improper motive. Thus, a police officer who is bound to report statements concerning other officers to a superior will not lose the protection of the privilege even though he or she knows or believes that the statement is false and defamatory unless the officer falsified the information. Conversely, even if the defendant believes that the defamatory statement is true, malice will be established by proof that the publication was actuated by a motive foreign to the privileged occasion. That is because qualified privilege is, and can only be, destroyed by the existence of an improper motive that actuates the publication" (Roberts v Bass at 31).