This principle is cited way too often in a more general way as it really apply. Is not so easy as "you must know every single rule, norm, law that exist, with n

This principle is cited way too often in a more general way as it really apply. Is not so easy as "you must know every single rule, norm, law that exist, with no possible excuses". If you are not in a reasonable position to have access to the norm, you do, and it do works, can defend yourself on that basis. I had successfully defended myself in two cases where the transit law was a little diffuse, but just saying "I understood it differently, I'm sorry"