Ignorance of the law and of legally material fact. The law-abiding citizen does not scan the statute books to discover loopholes or standards more lenient than those embodied in customary norms. The venerable maxim ignorantia legis neminem excusat rests not so much on administrative convenience as on the supposition that positive enactments merely make more determinate the customary and moral norms observed generally throughout society. Ignorance or mistake of law ought therefore to be an excuse only for the virtuous, as Dan Kahan has argued (1997). Going to the statute book ought to be an extraordinary occasion for the law-abiding. (Unlike the situation of those who are disposed to obey rather than to abide by the law and who would, one would imagine, devote substantial time to discovering obscure prescriptions.) Those who go to the statute book in a law-abiding spirit are to be forgiven if they make honest and reasonable mistakes. Those who go to the statute book hoping to find a legal dispensation for departing from community norms ought not to be forgiven, however reasonable their mistaken readings might be.
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