The law of the U.S. and other countries is full of such two-tiered systems, i.e. what is written and what is well-known, e.g. "Don't ask, don't tell". All huma

The law of the U.S. and other countries is full of such two-tiered systems, i.e. what is written and what is well-known, e.g. "Don't ask, don't tell". All human society works that way; we learn it at home and at school.