The rule that wilful blindness is equivalent to knowledge is essential, and is found throughout the criminal law. It is, at the same time, an unstable rule, because judges are apt to forget its very limited scope. A court can properly find wilful blindness only where it can almost be said that the defendant actually knew. He suspected the fact; he realised its probability; but he refrained from obtaining the final confirmation because he wanted in the event to be able to deny knowledge. This, and this alone, is wilful blindness. It requires in effect a finding that the defendant intended to cheat the administration of justice. Any wider definition would make the doctrine of wilful blindness indistinguishable from the civil doctrine of negligence in not obtaining knowledge. [Emphasis added.]
(Criminal Law: The General Part (2nd ed. 1961), at p. 159 (cited in Sansregret at p. 586.)
Professor Don Stuart makes the useful observation that the expression “deliberate ignorance” seems more descriptive than “wilful blindness”, as it connotes “an actual process of suppressing a suspicion”. Properly understood in this way, “the concept of wilful blindness is of narrow scope and involves no departure from the subjective focus on the workings of the accused’s mind” (Canadian Criminal Law: A Treatise (5th ed. 2007), at p. 241). While a failure to inquire may be evidence of recklessness or criminal negligence, as for example, where a failure to inquire is a marked departure from the conduct expected of a reasonable person, wilful blindness is not simply a failure to inquire but, to repeat Professor Stuart’s words, ‘deliberate ignorance’.
