BOOK I
GENERAL PART
TITLE II
ON CRIME
CHAPTER I
GENERAL ASSUMPTIONS
Article 18. Error regarding unlawfulness
1. Lack of knowledge of the law does not exclude the unlawfulness of any conduct that violates it.
2. An error regarding unlawfulness, if unavoidable, excludes guilt.
3. A penalty may be considered extraordinarily mitigated when the error regarding unlawfulness is avoidable.
Mistake of law - national proceedings
EDIT.