The President of Mexico creates regulations for the purpose of interpreting, clarifying, expanding or supplementing the language of legislative enactments. They are published in the Official Journal of the Federation.
Case law
Mexico utilizes a form of jurisprudence constante. The decisions of the Supreme Court are binding on lower courts as jurisprudencias only upon five consecutive and uninterrupted decisions approved by at least eight justices when in plenary sessions or by at least four justices when in chambers. The decisions of the Collegiate Circuit Courts are 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, of which the tesis jurisprudencial are binding, the tesis aisladas are not binding, and the tesis sobresalientes are theses of note which are not binding but have persuasive value. Such decisions are published in the Federal Judicial Weekly through its gazette. Complete decisions are rarely published in the 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 deems they should be published; instead, it mainly includes tesis de jurisprudencia or tesis aisladas. Moreover, theses that have acquired the character of binding criteria are published every year in an appendix to the Semanario. In some jurisdictions, there may also exist executive administrative courts, which are not bound by these jurisprudencias.
Doctrine
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. The legal treatises produced by these scholars are called doctrine, 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.
Custom
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.
Each of Mexico's 31 states and Mexico City has its own constitution, known as a state or local constitution. Each state's or Mexico City's laws and regulations are published in their respective Official State Gazettes. At the state and local level, publication of complete binding court opinions is extremely limited or simply nonexistent.
Jurisprudence
The civil law tradition 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.
