It seems to be a common observation that, in a Common Law based country, “every person is presumed to know the law”.
What exactly does this mean in a legal sense?
Does it mean that everyone is presumed to have memorized the written text of all applicable statutes? Does it mean that not only is everyone presumed to know the text of all applicable statutes, they are also presumed to know of every relevant case that constitutes precedent in the jurisdiction? Does it mean that they are presumed to know all the statutes and all the case law, and also know what rules of interpretation the jurisdiction’s courts use? Does it mean that they are presumed to know exactly how a court would rule on something even before the court actually rules on it?
If I were to approach my State Bar association and ask to become an attorney, and when asked to prove my legal knowledge, claim, “Every person is presumed to know the law.”, I doubt they would accept that. But why? Does this legal principle only apply in specific circumstances?
Are there any legal systems where people are not presumed to know the law?