Ley de Extradicion Internacional — Complete Analysis
Mexico’s Ley de Extradicion Internacional (LEI) is the domestic statute that governs extradition when no bilateral treaty exists between Mexico and the requesting state, or when an existing treaty does not cover the specific offense or procedural situation at hand. Published in the Diario Oficial de la Federacion on December 29, 1975, and most recently amended in 2023, the LEI provides a complete procedural framework that operates independently of any international agreement.
Understanding the LEI is essential for anyone facing extradition proceedings in Mexico. While treaty-based extraditions are more common between countries like the United States and Mexico, dozens of extradition requests each year are processed under the LEI framework. The law provides significant procedural protections that, when properly invoked, can defeat or substantially delay extradition.
Overview of the LEI Procedure
The LEI establishes a multi-stage process with built-in judicial oversight. Here is the procedural sequence from initial request to final resolution:
- Diplomatic Request: The requesting state submits a formal extradition request through diplomatic channels to Mexico’s Secretaria de Relaciones Exteriores (SRE).
- SRE Evaluation: The SRE reviews the request for compliance with formal requirements, including proper documentation, translation, and authentication.
- FGR Involvement: The Fiscalia General de la Republica (FGR) receives the case and files the extradition petition before a federal judge.
- Federal Judge Hearing: A federal judge conducts a formal hearing where the person sought has the right to present defenses, challenge evidence, and argue legal objections.
- Judicial Decision: The judge issues a formal opinion (opinion juridica) recommending or denying extradition.
- SRE Final Decision: The SRE makes the final extradition decision, which may accept or reject the judge’s recommendation.
- Appeal and Amparo: The person sought may file an Amparo (constitutional injunction) to challenge the decision before a Tribunal Colegiado or the Supreme Court.
At each stage, competent legal representation can identify grounds to challenge, delay, or defeat the extradition request. The entire process typically takes 12 to 24 months, and in complex cases, substantially longer.
Download the Full Law
Download the Ley de Extradicion Internacional (PDF, Spanish original)
Detailed Commentary by Chapter
Below is a detailed analysis of the LEI organized by chapter. Each article includes the original Spanish text and English commentary explaining its practical implications for extradition defense.
Chapter I — General Provisions (Articles 1–6)
Article 1 — Scope of the Law
Las disposiciones de esta Ley son de orden publico, de caracter federal y tienen por objeto determinar los casos y las condiciones para entregar a los Estados que lo soliciten, cuando no exista tratado internacional, a los acusados ante sus tribunales, o condenados por ellos, por delitos del orden comun.
Commentary: Article 1 establishes the fundamental scope: the LEI applies when there is no bilateral extradition treaty. This is the provision that destroys the myth of “no extradition treaty means no extradition.” Mexico can and does extradite to any country in the world under this law. Defense counsel must evaluate whether the LEI or a treaty applies, as procedural protections differ between the two frameworks.
Article 2 — Reciprocity Requirement
Los procedimientos establecidos en esta Ley se deberan aplicar para el tramite y resolucion de cualquier solicitud de extradicion que se reciba de un gobierno extranjero.
Commentary: This article confirms the LEI applies to ALL foreign government requests. A critical defense point arises from the implicit reciprocity principle: Mexico may refuse extradition if the requesting state would not reciprocate under similar circumstances. Defense counsel should research whether the requesting country has refused extradition requests from Mexico, which can serve as grounds for denial.
Article 3 — SRE Authority
La extradicion podra ser rehusada cuando el reclamado sea de nacionalidad mexicana. La Secretaria de Relaciones Exteriores, en todo caso, oira previamente la opinion de la autoridad judicial competente.
Commentary: Article 3 provides one of the strongest defenses in Mexican extradition law: nationality. Mexican nationals enjoy a constitutional protection against extradition that, while not absolute since the 1999 constitutional amendment, remains a potent defense tool. Foreign nationals who obtain Mexican citizenship may invoke this provision. The SRE retains discretionary authority to refuse extradition of Mexican nationals, and must always hear from the judicial authority before deciding.
Article 5 — Prohibition on Political Offenses
No se concedera la extradicion cuando: I.- El reclamado haya sido objeto de absolucion, indulto o amnistia, o cuando hubiere cumplido la condena relativa al delito que motive el pedimento; II.- Falte querella de parte legitima, si conforme a la ley penal mexicana el delito exige ese requisito; III.- Haya prescrito la accion o la pena, conforme a la ley penal mexicana o a la ley aplicable del Estado solicitante; IV.- El delito haya sido cometido dentro del ambito de la jurisdiccion de los tribunales de la Republica; V.- El delito por el que se pide la extradicion sea del orden politico o del orden militar.
Commentary: Article 5 is one of the most important defensive provisions. It lists mandatory grounds for refusal. The political offense exception (subsection V) has been used successfully in cases where the underlying prosecution is politically motivated. Subsection III regarding prescription (statute of limitations) requires comparison of both Mexican and requesting state law — if the crime is time-barred under either jurisdiction, extradition must be denied. Subsection I prevents double jeopardy: if the person has already been acquitted, pardoned, or served the sentence, extradition cannot proceed.
Article 6 — Death Penalty Prohibition
No se concedera la extradicion si el delito por el cual se pide es punible con la pena de muerte en el Estado solicitante, a menos de que este de las seguridades suficientes de que no sera aplicada dicha pena o de que se impondra una menor.
Commentary: This is a critical provision for extraditions to the United States. Mexico’s constitution prohibits the death penalty, and Mexican courts take this prohibition seriously. If the offense carries a potential death sentence in the requesting state, extradition will be denied unless binding diplomatic assurances are provided that the death penalty will not be sought or imposed. In US cases, this has been used as leverage to negotiate favorable plea agreements before extradition.
Chapter II — Requirements for Extradition (Articles 7–16)
Article 7 — Dual Criminality
La extradicion no podra concederse sino por delitos que sean punibles conforme a la ley mexicana y a la del Estado solicitante con pena de prision cuyo termino medio aritmetico por lo menos sea de un ano.
Commentary: The dual criminality requirement is one of the most frequently litigated provisions. The offense must be a crime under both Mexican law and the law of the requesting state, with a minimum average penalty of one year. Defense counsel should carefully analyze whether the specific conduct alleged constitutes a crime under Mexican law — not merely a similar offense, but one that matches in essential elements. Technical regulatory offenses, tax crimes with different definitions, and offenses that do not exist in Mexican law are frequent grounds for challenging dual criminality.
Article 10 — Required Documentation
La peticion formal de extradicion y los documentos en que se apoye, deberan contener: I.- La expresion del delito por el que se pide la extradicion; II.- La prueba que acredite el cuerpo del delito y la probable responsabilidad del reclamado; III.- Las caracteristicas del reclamado que hagan posible su identificacion; IV.- Copia autentica de la orden de aprehension librada por autoridad competente.
Commentary: Article 10 imposes strict documentation requirements. The requesting state must provide: (1) a clear description of the crime, (2) evidence establishing the corpus delicti and probable responsibility, (3) identification details, and (4) an authenticated arrest warrant. Defense counsel should scrutinize every document for compliance. Missing or deficient documentation is grounds for rejection. Authentication requirements are particularly important — documents must be properly apostilled or legalized through diplomatic channels.
Article 11 — Translation Requirements
Los documentos senalados en el articulo anterior deberan estar redactados en espanol o acompanados de su traduccion, debidamente certificada en el pais de origen.
Commentary: All documentation must be in Spanish or accompanied by certified translations. This seemingly technical requirement has proven to be a substantive defense tool. Inaccurate translations, uncertified translations, or translations that alter the meaning of legal terms have been successfully challenged. Defense counsel should review all translated documents against the originals and challenge any discrepancies.
Article 12 — Specialty Rule
El individuo que haya sido entregado por extradicion no podra ser juzgado ni castigado por delito distinto del que motivo la extradicion, a no ser: I.- Que se trate de un delito diverso, pero conexo con el que motivo la extradicion; II.- Que el extraditado lo consienta expresamente; III.- Que antes de regresar al territorio de la Republica tenga oportunidad de salir del Estado solicitante y no lo haga.
Commentary: The specialty rule prevents the requesting state from prosecuting the extradited person for any crime other than the one specified in the extradition request. This is a fundamental protection that persists after extradition. The exceptions are narrow: connected offenses, express consent, and the “free departure” doctrine. Defense counsel in the receiving country should monitor compliance and raise specialty violations immediately.
Article 15 — Provisional Arrest
La Secretaria de Relaciones Exteriores podra ordenar, atendiendo a la urgencia del caso, la detencion provisional del reclamado, la que se verificara de conformidad con las leyes respectivas. Si dentro del plazo de sesenta dias naturales que establece la Constitucion, contado a partir de la fecha en que se llevo a cabo la detencion provisional, no se recibiere la peticion formal de extradicion, se levantara dicha detencion y no se procedera a nueva detencion con base en la misma solicitud.
Commentary: Provisional arrest allows the SRE to order detention before the formal request arrives. However, the 60-day constitutional limit is absolute. If the requesting state fails to submit the formal extradition petition within 60 calendar days, detention must be lifted and the person released. The requesting state cannot then rearrest on the same basis. Defense counsel should calendar this deadline meticulously and enforce it aggressively. Additionally, the person detained provisionally has immediate habeas corpus and Amparo rights.
Chapter III — Procedure (Articles 17–28)
Article 17 — SRE Initial Review
Recibida la peticion formal de extradicion, la Secretaria de Relaciones Exteriores la examinara y si la encontrare improcedente no la admitira, lo cual comunicara al Estado solicitante.
Commentary: The SRE performs the initial admissibility review and may reject the request outright if it fails to meet basic requirements. Defense counsel should submit early representations to the SRE during this phase, arguing procedural and substantive defects. While the SRE is not required to consider defense submissions at this stage, effective advocacy has resulted in requests being rejected before reaching the judicial phase.
Article 19 — FGR Petition to Judge
Admitida la peticion, la Secretaria de Relaciones Exteriores enviara la requisitoria al Procurador General de la Republica, y este pedira al Juez de Distrito que corresponda, la detencion del reclamado y la practica de las diligencias necesarias.
Commentary: Note: The reference to “Procurador General de la Republica” in the original text now corresponds to the Fiscalia General de la Republica (FGR) following the 2018 constitutional reform. The FGR files the extradition petition before a federal district judge, who then issues an arrest warrant. This is the moment when the judicial phase begins, and the person sought gains full procedural rights including appointed counsel, access to the file, and the right to present evidence.
Article 24 — Right to Hearing
Una vez detenido el reclamado, se le hara comparecer ante el respectivo Juez de Distrito y este le dara a conocer el contenido de la peticion de extradicion y los documentos que la acompanen, asi como las garantias de que gozara.
Commentary: Article 24 guarantees the right to a hearing before a federal judge. At this hearing, the person must be informed of the extradition request, given access to all documents, and advised of their rights. This is the critical stage for presenting defenses: challenging dual criminality, raising prescription, invoking the political offense exception, demonstrating identity errors, or arguing human rights violations in the requesting state. The judge’s opinion carries significant weight, though the SRE makes the final decision.
Article 25 — Defense Period
Al detenido se le otorgara un termino de tres dias para oponer excepciones, que el juez resolvera dentro de los cinco dias siguientes.
Commentary: The person sought has three days to file formal objections (excepciones) after the initial hearing. The judge must rule on these within five days. While this timeline appears tight, competent defense counsel will have prepared objections in advance. Common objections include: lack of dual criminality, prescription, defective documentation, specialty violations, and human rights concerns. An Amparo filing can also effectively extend these deadlines by obtaining a judicial suspension.
Article 26 — Evidence Presentation
El reclamado podra, durante el periodo de prueba, ofrecer pruebas y alegar lo que a su derecho conviniere.
Commentary: This article guarantees the right to present evidence and arguments. Defense counsel should use this period to introduce expert opinions on foreign law, evidence of political persecution, documentation of human rights conditions in the requesting state, medical evidence if relevant, and any other materials supporting the defense. Mexican courts have increasingly considered human rights reports from international organizations when evaluating extradition requests.
Article 27 — Judicial Opinion
Una vez producidas las pruebas y formulados los alegatos, el juez emitira su opinion dentro de los cinco dias siguientes, y la remitira con el expediente a la Secretaria de Relaciones Exteriores.
Commentary: The judge’s opinion, while formally advisory, is given considerable weight by the SRE. A judicial opinion recommending denial of extradition is very difficult for the SRE to override. The opinion must address all defense arguments and explain the legal reasoning. If the opinion is unfavorable, it becomes the primary target for Amparo review, where constitutional tribunal judges can examine the reasoning and evidence with fresh eyes.
Chapter IV — Rights of the Person Sought (Articles 29–35)
Article 29 — Right to Counsel
El reclamado tendra derecho a nombrar defensor; si no lo hiciere, el juez le designara uno de oficio.
Commentary: The right to legal counsel is absolute and immediate. If the person cannot afford private counsel, the court must appoint a public defender. However, court-appointed defenders in extradition cases often lack specialized knowledge. Engaging experienced private extradition counsel before the arrest — or as soon as possible after — dramatically improves outcomes. Private counsel can begin building the defense strategy, filing preemptive Amparos, and preparing evidence before the formal hearing.
Article 30 — Right to Interpreter
Si el reclamado no habla espanol, se le nombrara un traductor.
Commentary: Non-Spanish speakers are entitled to an interpreter throughout the proceedings. This right extends to all documents, hearings, and communications with the court. Violations of this right constitute grounds for Amparo relief and can result in nullification of proceedings.
Article 33 — Amparo Rights
El reclamado podra interponer el juicio de amparo contra la resolucion del juez o contra el acuerdo de la Secretaria de Relaciones Exteriores.
Commentary: The right to Amparo is the ultimate procedural safeguard. Amparo can be filed against both the judge’s opinion and the SRE’s final decision. The Amparo proceeding includes an automatic suspension mechanism that halts the extradition while the constitutional challenge is resolved. This alone can add 6 to 18 months to the process and provides a fresh review before a specialized constitutional tribunal. Amparo is discussed in detail on our Amparo page.
Chapter V — Execution (Articles 36+)
Article 36 — Surrender Procedure
Concedida la extradicion, la entrega del reclamado se efectuara previo acuerdo con el Estado solicitante, por conducto de la Secretaria de Relaciones Exteriores.
Commentary: Even after extradition is granted, the physical surrender must be coordinated through diplomatic channels. If the requesting state fails to take custody within the time period specified by the SRE (typically 60 days), the person must be released and cannot be re-arrested on the same grounds. Defense counsel should monitor this deadline carefully. Additionally, surrender can be temporarily delayed for medical reasons, pending criminal proceedings in Mexico, or to allow completion of a sentence being served in Mexico.
Article 37 — Deferred and Temporary Surrender
Si el reclamado fuere mexicano y por ese motivo se rehusare la extradicion, la Secretaria de Relaciones Exteriores comunicara el hecho al Procurador General de la Republica, para el ejercicio de la accion penal que correspondiere.
Commentary: When extradition is refused because the person is a Mexican national, the case file is forwarded to the FGR for potential domestic prosecution. This implements the aut dedere aut judicare principle (extradite or prosecute). Defense counsel should be aware that refusing extradition on nationality grounds does not end the legal jeopardy — it may simply shift the forum. However, Mexican prosecution of the underlying offense may result in more favorable outcomes given different sentencing frameworks.
Facing extradition proceedings under the LEI? Every day without legal representation is a missed opportunity to build your defense.