Part I. General Provisions
Chapter 3. Conditions governing criminal liability
Section 42.
If any person has committed an act in a state of ignorance concerning circumstances that determine criminal liability or increase the penalty for the said act, such circumstances shall not be attributable to him.
If the ignorance can be ascribed to negligence, in cases in which negligence is punishable the penalty prescribed for such negligence shall be applicable.
Ignorance resulting from self-induced intoxication shall be disregarded. In such cases the offender shall be judged as if he were sober.
Error regarding the value of an object or the amount at which damages must be assessed shall only be taken into account when criminal liability is conditional thereon.
Intoxication
Negligence
Mistake of fact - national proceedings
EDIT.