Ignorance of the law no reason to draw conclusions

But it would, in my view, be an unwarranted extension of the principles laid down in existing authority to impute to a decision-maker a reason for acting which did not in fact exist by reason of a presumption that he or she knew the law.

Qube Ports Pty Ltd v McMaster (2016) FCAFC 123 delivered 9 September 2016 per ALLSOP CJ, JESSUP AND BROMBERG JJ