Extradition from Mexico to the United States
The extradition corridor between Mexico and the United States is the most active in the Western Hemisphere. Mexico extradites more individuals to the US than to any other country, with dozens of cases processed annually. The legal framework governing this relationship is the 1978 Extradition Treaty, supplemented by three subsequent protocols and decades of judicial interpretation.
If you are in Mexico and facing a US extradition request, understanding this specific treaty and the procedural realities is not optional — it is a matter of liberty.
The US-Mexico Extradition Treaty of 1978
The Treaty on Extradition between the United States of America and the United Mexican States was signed on May 4, 1978, and entered into force on January 25, 1980. It has been supplemented by protocols signed in 1997, 2001, and 2012. Key provisions include:
- Extraditable offenses: Any offense punishable by more than one year of imprisonment under the laws of both countries (dual criminality with minimum penalty threshold).
- Mandatory refusal grounds: Political offenses, military-only offenses, double jeopardy, and lapse of time (prescription).
- Discretionary refusal: Mexico may refuse if the person is a Mexican national (though this has become increasingly rare since the 1999 constitutional amendment).
- Death penalty provision: When the offense is punishable by death in the requesting state but not in the requested state, extradition may be conditioned on assurances that the death penalty will not be imposed or carried out.
- Specialty rule: The extradited person may only be prosecuted for the offense(s) specified in the extradition grant.
- Provisional arrest: Permitted in urgent cases, with strict time limits for filing the formal request.
The Extradition Procedure: Step by Step
A US extradition request follows this procedural path through the Mexican legal system:
- US Department of Justice / State Department: The US Attorney’s office prepares the extradition package. The Office of International Affairs (OIA) at the Department of Justice reviews it, and the State Department transmits it through diplomatic channels.
- Mexican SRE (Secretaria de Relaciones Exteriores): The SRE receives the request and conducts a preliminary review for compliance with treaty requirements.
- FGR (Fiscalia General de la Republica): The FGR files the extradition petition before a federal district judge and requests the arrest of the person sought.
- Federal District Judge: The judge issues an arrest warrant, conducts the extradition hearing, hears evidence and defenses, and issues a formal judicial opinion recommending or opposing extradition.
- SRE Final Decision: Based on the judge’s opinion, the SRE issues the final extradition decision. While technically the SRE can overrule the judge, in practice a negative judicial opinion almost always leads to denial.
- Amparo: The person sought may file an Amparo challenging the judge’s opinion or the SRE’s decision before a Tribunal Colegiado (Circuit Court). This provides a full constitutional review.
- Supreme Court: In exceptional cases involving constitutional questions of general importance, the matter may reach the Suprema Corte de Justicia de la Nacion.
Key Defenses in US-Mexico Extradition Cases
Experienced extradition counsel will evaluate every available defense. The most effective in the US-Mexico context include:
- Death penalty prohibition: Mexico will not extradite if the person faces a potential death sentence. The US must provide binding diplomatic assurances that the death penalty will not be sought. This has been used as leverage to negotiate favorable plea agreements.
- Dual criminality: The specific conduct must constitute a crime under both US federal law (or state law) and Mexican federal law. Technical regulatory offenses, certain tax crimes, and offenses with no Mexican equivalent can fail the dual criminality test.
- Political offense exception: While narrowly interpreted, this defense remains available when the prosecution is politically motivated or when the offense is connected to political activity.
- Specialty rule: Challenging the scope of the extradition request to prevent the US from adding charges after surrender.
- Prescription (statute of limitations): If the offense is time-barred under Mexican law, extradition must be refused regardless of the US statute of limitations.
- Human rights concerns: Conditions of confinement, risk of solitary confinement, disproportionate sentencing (including mandatory minimums and sentencing enhancements), and inability to receive a fair trial can all be raised.
- Procedural defects: Deficient documentation, improper authentication, translation errors, and failure to meet treaty requirements.
- Identity challenges: Misidentification cases, though rare, do occur and must be raised immediately.
Timelines
US-Mexico extradition cases typically follow these timelines:
- Provisional arrest to formal request: 60 days (constitutional maximum).
- Judicial phase (hearing to opinion): 3 to 6 months in straightforward cases; 6 to 12 months in complex cases.
- SRE decision: 1 to 3 months after the judicial opinion.
- Amparo proceedings: 6 to 18 months for initial Amparo; additional time if the case reaches the Supreme Court.
- Total timeline: 6 to 18 months without Amparo; 18 to 36 months with full constitutional litigation.
These timelines are approximate. Strategic litigation by experienced counsel can extend the process substantially, providing time to negotiate with US prosecutors, prepare for voluntary surrender on favorable terms, or pursue alternative resolutions.
Facing a US extradition request in Mexico? The earlier you engage experienced counsel, the more options remain available.