Criminal Law in Mexico
Introduction
Mexican criminal law is governed by the Federal Criminal Code (Código Penal Federal, CPF) and the criminal codes of each state, alongside the National Code of Criminal Procedure (Código Nacional de Procedimientos Penales, CNPP). The 2008 constitutional reform transformed Mexico’s criminal justice system from a written inquisitorial model to an accusatorial adversarial system, implemented through the CNPP of 2014. This reform fundamentally restructured criminal investigations, trials, and sentencing.
Sources and Principles
Criminal law in Mexico is based on the principle of legality (nullum crimen, nulla poena sine lege), enshrined in Article 14 of the Constitution. The Federal Criminal Code defines federal crimes, which include drug trafficking, organized crime, firearms offenses, human trafficking, money laundering, and crimes against the environment. State criminal codes define ordinary crimes such as homicide, theft, robbery, and assault. The principle of non-retroactivity, favorability, and proportionality guide criminal liability and punishment.
Classification of Crimes
Crimes are classified as felonies (delitos) or misdemeanors (faltas), with felonies further categorized by their gravity. The CPF distinguishes between intentional crimes (dolosos) and negligent crimes (culposos). Attempted crimes are generally punishable. Specific categories include crimes against life (homicide, femicide), crimes against personal integrity (assault, torture), crimes against liberty (kidnapping, human trafficking), property crimes (theft, fraud, robbery), and crimes against public health (drug offenses, corruption).
Penalties and Sentencing
Penalties under Mexican criminal law include imprisonment, fines, community service, and disqualification from public office. The CPF establishes sentencing ranges for each crime, with aggravating and mitigating factors. Imprisonment for federal crimes typically ranges from six months to 60 years, with life imprisonment prohibited by the Constitution (Article 22). The system emphasizes rehabilitation and social reintegration as objectives of punishment.
Criminal Procedure Reform
The 2008 constitutional reform introduced the adversarial accusatorial system, replacing the former inquisitorial written procedure. The CNPP establishes a comprehensive procedural framework including investigation (by the Public Prosecutor’s Office with judicial oversight), pre-trial detention hearings, formal accusation, discovery, oral trial, sentencing, and appeals. Key innovations include the presumption of innocence (Article 20 of the Constitution), alternative dispute resolution mechanisms, and oral proceedings.
Conclusion
Mexican criminal law has undergone a fundamental transformation through the 2008 constitutional reform and the adoption of the CNPP. The shift to an adversarial system has enhanced procedural fairness, strengthened the presumption of innocence, and introduced oral trials. Challenges remain in implementing consistent standards across states and ensuring access to justice for all.