
O criminal law[1] Brazil is primarily governed by the Penal Code (Decree-Law 2848/40) and operates under principles of territoriality, with laws applied within national borders and in specific international circumstances. The legal framework distinguishes between different types of criminal laws, including incriminating, permissive and explanatory statutes. Key principles include the non-retroactivity of criminal laws, with exceptions that benefit defendants. O system[3] recognises various legal scenarios such as Abolitio Criminis (decriminalisation), Novatio Legis in Mellius (legal improvements that benefit defendants) and Novatio Legis in Pejus (legal changes potentially unfavourable to defendants). Criminal laws are applied on the basis of the theory of conduct, with the predominance of jurisdiction[2] federal. The legal system allows for the extraterritorial application of the law[4] in certain circumstances and provides mechanisms for dealing with conflicts in criminal legislation over time.
A criminal law, em sentido amplo, é a principal fonte imediata do criminal law, em virtude do princípio da legalidade and anterioridade, de acordo com os quais uma norma incriminadora deve ser posta pelos representantes do povo e deve valer apenas após sua entrada em vigor.