Código Penal Comentado - Art. 1º CP - Reserva Legal x Contravenção Penal - Lex Escrita, Estrita...

Understanding the Principle of Legality in Criminal Law

Introduction to the Discussion

• Professor Márcio Caldas continues his series on general theory of criminal law, focusing on Article 1 and previous questions raised.

Questioning the Creation of Contraventions

• The professor revisits a question from the last video regarding whether a contravention can be created without a specific law, as both the Penal Code and Federal Constitution state there is no crime without prior law.

• He emphasizes that it is necessary to have strict legal provisions for creating any penal infractions, including contraventions.

Legal Requirements for Penal Infractions

• There are two types of penal infractions: crimes and contraventions; both require established laws for validity.

• The principle of legality mandates that laws must be written, precise, and pre-existing to ensure clarity in what constitutes an infraction.

Characteristics of Valid Laws

• A valid law cannot rely on customs or societal acceptance; it must be explicitly stated in legislation. For example, customary practices like gambling do not negate legal penalties.

• Analogies cannot be used to create new crimes or enhance penalties against defendants; they can only serve to favor defendants under certain conditions.

Clarity and Precision in Legal Definitions

• Laws must provide clear definitions; vague terms such as "torture" need specific parameters to avoid ambiguity in enforcement.

• Prior legal definitions are essential—actions cannot be retroactively criminalized after they have been performed without existing laws at that time.