The law of Mexico is based upon the Constitution of Mexico and follows the civil law tradition.
The hierarchy of sources of law can be viewed as the Constitution, legislation, regulations, and then custom. Alternatively, the hierarchy can be viewed as the Constitution, treaties, statutes, codes, doctrine, custom, and then general principles of law.
The Constitution of Mexico is the fundamental law (Spanish; Castilian: ley fundamental).
Congress creates legislation in the form of regulatory laws (Spanish; Castilian: leyes reglamentarias) that implement the Constitution, organic acts (Spanish; Castilian: leyes orgánicas) that implement the organization, powers, and functions of governmental agencies, and ordinary laws (Spanish; Castilian: leyes ordinarias). They are published in the Official Journal of the Federation (Spanish; Castilian: Diario Oficial de la Federación, DOF).
The President of Mexico creates regulations (Spanish; Castilian: reglamentos) for the purpose of interpreting, clarifying, expanding or supplementing the language of legislative enactments. They are published in the Official Journal of the Federation (Spanish; Castilian: Diario Oficial de la Federación, DOF).
Mexico utilizes a form of French: [[jurisprudence constante]]. The decisions of the Supreme Court are binding on lower courts as Spanish; Castilian: jurisprudencias only upon five consecutive and uninterrupted decisions (Spanish; Castilian: ejecutorias) approved by at least eight justices when in plenary sessions (French: [[en banc]]) or by at least four justices when in chambers. The decisions of the Collegiate Circuit Courts are Spanish; Castilian: jurisprudencias provided they are based upon five consecutive and uninterrupted decisions approved by unanimity of votes of the magistrates who compose each collegiate court. Decisions are distilled into theses (Spanish; Castilian: tesis), of which the Spanish; Castilian: tesis jurisprudencial are binding (Spanish; Castilian: jurisprudencia obligatoria), the Spanish; Castilian: tesis aisladas are not binding, and the Spanish; Castilian: tesis sobresalientes are theses of note which are not binding but have persuasive value.
Such decisions are published in the Federal Judicial Weekly (Spanish; Castilian: Semanario Judicial de la Federación) through its gazette (Spanish; Castilian: Gaceta del Semanario Judicial de la Federación). Complete decisions are rarely published in the Spanish; Castilian: Semanario, though it is not unheard of if the Supreme Court, a collegiate circuit court, or the General Coordinator of Compilation and Systematization of Theses (Spanish; Castilian: Coordinación General de Compilación y Sistematización de Tesis) deems they should be published; instead, it mainly includes Spanish; Castilian: tesis de jurisprudencia or Spanish; Castilian: tesis aisladas.[1] Moreover, theses that have acquired the character of binding criteria (Spanish; Castilian: tesis de jurisprudencia) are published every year in an appendix to the Spanish; Castilian: Semanario.[1]
In some jurisdictions, there may also exist executive administrative courts, which are not bound by these Spanish; Castilian: jurisprudencias.[2] [3]
The civil law tradition was developed by, and as such the "authorities" were and continue to be, legal scholars and not judges and lawyers as in the common law tradition.[4] The legal treatises produced by these scholars are called doctrine (Spanish; Castilian: doctrina), and are used much in the same way case law is used in the common law tradition. However, these scholarly contributions do not carry the force of law and are not legally binding.
Mexican law recognizes custom, the rules, principles, and norms formed through a gradual but uniform passage of time, but only when this recognition is based upon an explicit provision of the applicable law allowing for such recognition.
"General principles of law", expressly cited by Article 14 of the Constitution, have not been expressly defined by legislation, but legal maxims such as equity, good faith, Latin: [[pacta sunt servanda]], the right of self-defense, and Latin: [[suum cuique]] tend to be cited by legal scholars.
Each of Mexico's 31 states and Mexico City has its own constitution, known as a state or local constitution (Spanish; Castilian: Constitución del Estado or Spanish; Castilian: Constitutución local). Each state's or Mexico City's laws and regulations are published in their respective Official State Gazettes (Spanish; Castilian: Gaceta Oficial del Estado). At the state and local level, publication of complete binding court opinions (versus Spanish; Castilian: tesis) is extremely limited or simply nonexistent.[1]
The civil law tradition (as developed by the legal scholars, i.e. doctrine) tends to treat the divisions of law in normative terms. There are two major areas of law: private law, concerning the relationships between individuals, and public law, concerning the relationships between individuals and the government. The civil code is the most important embodiment of law, based on Roman law. Other topics include those related to philosophy of law, including the major schools of thought and the major disagreements; objective law and subjective rights; substantive law and procedural law; statutory law and customary law; federal law, state law and municipal law; and national law, international law and community law.
Mexico's major codes regarding public law are the Federal Criminal Code (the criminal code) and the National Criminal Procedure Code (the code of criminal procedure). Other codes of importance include the Fiscal Code (Spanish; Castilian: Codigo Fiscal de la Federacion) (tax law) and the Federal Labor Law (Spanish; Castilian: Ley Federal del Trabajo) (Mexican labor law).
Mexico's major codes regarding private law are the Federal Civil Code (the civil code), Federal Commercial Code (the commercial code), and the Federal Civil Procedure Code (the code of civil procedure).