Even where, as with the present charges, actual knowledge is either a specified element of the offence charged or a necessary element of the guilty mind required for the offence, it may be established as a matter of inference from the circumstances surrounding the commission of the alleged offence. However, three matters should be noted. First, in such cases the question remains one of actual knowledge: Giorgianni (1985) 156 CLR 473 at 504-507; 16 A Crim R 163 at 186-189; He Kaw Teh at 570; 237. It is never the case that something less than knowledge may be treated as satisfying a requirement of actual knowledge. Secondly, the question is that of the knowledge of the accused and not that which might be postulated of a hypothetical person in the position of the accused, although, of course, that may not be an irrelevant consideration. Finally, where knowledge is inferred from the circumstances surrounding the commission of the alleged offence, knowledge must be the only rational inference available. All that having been said, the fact remains that a combination of suspicious circumstances and failure to make inquiry may sustain an inference of knowledge of the actual or likely existence of the relevant matter. In a case where a jury is invited to draw such an inference, a failure to make inquiry may sometimes, as a matter of lawyer's shorthand, be referred to as wilful blindness. Where that expression is used, care should be taken to ensure that a jury is not distracted by it from a consideration of the matter in issue as a matter of fact to be proved beyond reasonable doubt.