Extradition From Mexico to the United States: Everything You Need to Know

Extradition from Mexico to the United States is governed by the 1978 Extradition Treaty between the United States and Mexico, which took effect on January 25, 1980.

The United States sends a formal request through diplomatic channels, a Mexican federal judge reviews the evidence, and Mexico’s Foreign Ministry makes the final surrender decision.

The process can take months or years, the person has real defenses under the treaty and Mexican law, and once Mexico says yes, the case lands in a U.S. federal courtroom where new deadlines and new risks begin immediately.

I have handled the U.S. side of these cases for families watching a relative sit in Mexican custody, and this article walks through what actually happens at every stage.

How Does Extradition From Mexico to the United States Work?

Extradition from Mexico follows a three-part path: a diplomatic request from the United States, a judicial review in Mexico, and a final decision by Mexico’s Secretariat of Foreign Relations.

The treaty controls what the United States must prove, and Mexico’s own law, the Ley de Extradición Internacional of 1975, controls how the case moves through the Mexican system.

According to a Law Library of Congress report on the treaty, all extradition requests in Mexico are conducted and resolved by the Secretariat of Foreign Relations, regardless of the person’s nationality.

On the U.S. side, the Department of Justice’s Office of International Affairs reviews and approves every formal federal extradition request before it goes out, as set out in the Justice Manual’s section on international extradition.

The treaty applies to state charges as well as federal ones, so a Texas state warrant can drive an extradition just like a federal indictment.

Formal requests based on state charges are also reviewed and approved by the Office of International Affairs at the request of the Department of State.

What Does the 1978 Extradition Treaty Require?

The treaty requires the United States to show that the charged conduct is a crime in both countries, punishable by at least one year of imprisonment, and supported by enough evidence to justify holding the person for trial under Mexican standards.

Article 1 obligates each country to extradite people charged with, convicted of, or wanted to serve a sentence for a covered offense.

Article 2 sets out the dual criminality requirement, covering willful acts listed in the treaty’s appendix and punishable in both countries by deprivation of liberty with a maximum of not less than one year.

Article 10 requires the request to travel through the diplomatic channel with a statement of the facts, the text of the legal provisions involved, identification information, and, for someone not yet convicted, a certified copy of the arrest warrant plus evidence that would justify holding the person for trial.

That evidence requirement in Article 3 is a real checkpoint, not a formality, because the documents must satisfy the laws of the requested country.

What Happens in Mexico After the Arrest?

After the arrest, the person is held in Mexican custody while the formal extradition package is reviewed by a Mexican federal judge and then by the Secretariat of Foreign Relations.

Many of these cases start with a provisional arrest, which is an urgent detention based on the existence of a U.S. arrest warrant before the full extradition package arrives.

Under Article 11 of the treaty, provisional arrest must end if Mexico’s executive authority does not receive the formal extradition request and supporting documents within 60 days of the apprehension.

Release on that ground does not end the matter, because the treaty allows the extradition to proceed if the formal request and documents are delivered later.

When the Secretariat of Foreign Relations grants surrender, the person can seek protection from Mexico’s federal courts, including through an amparo, which is Mexico’s constitutional protection lawsuit, and Mexican counsel handles that fight.

Is the Mexican Extradition Hearing a Trial?

No, the Mexican proceeding decides whether the treaty’s conditions for surrender are met, not whether the person is guilty.

Under Article 3 of the treaty, the evidence only has to be sufficient under the requested country’s law to justify holding the person for trial, which is a far lower bar than proof beyond a reasonable doubt.

Arguments about innocence, weak witnesses, and unreliable informants mostly wait for the U.S. courtroom, because the Mexican judge is not weighing guilt.

Families who expect the Mexican hearing to clear their relative are measuring the wrong fight, and the defense effort in Mexico belongs on the treaty’s own requirements and exceptions, like dual criminality and the lapse of time rule.

Understanding what the Mexican hearing can and cannot decide is the single best way for a family to read the news coming from the Mexican proceeding.

How Long Does the Extradition Process Take?

There is no fixed timeline, and cases commonly run from several months to several years.

The Department of Justice acknowledges in its Justice Manual that predicting the time required to return a person to the United States is difficult and depends on the circumstances of the individual case and the practice of the foreign country.

Procedural challenges in Mexico, court backlogs, and the back-and-forth over assurances all add time.

A Dallas case shows how fast it can move when the person does not fight: Salvador Martinez of Grand Prairie fled before sentencing in a methamphetamine conspiracy, was arrested in Mexico in December 2019 on a formal U.S. extradition request, and was extradited on May 6, 2020, roughly five months later.

He was sentenced to 300 months in federal prison in Dallas after his return.

For families, that stretch of time is not dead time, and the section below on what families can do explains why.

What Defenses Can Stop an Extradition in Mexico?

The treaty itself contains the main defenses: dual criminality, the political offense exception, the double jeopardy bar, the lapse of time provision, the death penalty assurance requirement, and the nationality provision.

Each one is written into a specific treaty article, and each one gets argued before the Mexican judge and the Secretariat of Foreign Relations.

These defenses belong to the Mexican leg of the case, which is why a working partnership between Mexican counsel and U.S. counsel matters so much.

In my cases, Mexican counsel runs the Mexican proceeding while I prepare the U.S. side, and information flows both ways.

Does the Charge Have to Be a Crime in Both Countries?

Yes, and this is the dual criminality requirement in Article 2 of the treaty.

The conduct must be punishable in both the United States and Mexico by imprisonment with a maximum of at least one year.

The treaty’s appendix lists 31 categories of offenses, including drug trafficking, fraud, murder, kidnapping, and money laundering related offenses, and Article 2 also reaches unlisted willful acts that are felonies under the federal laws of both countries.

Attempt, conspiracy, and participation in a covered offense are extraditable too, which matters because so many U.S. requests rest on federal conspiracy cases rather than completed substantive counts.

Where the U.S. charging theory does not line up with any crime under Mexican law, dual criminality becomes a genuine fight.

What Is the Political Offense Exception?

Article 5 of the treaty bars extradition when the offense is political or of a political character, and it also bars extradition for purely military offenses.

The treaty closes two loopholes by listing offenses that can never be treated as political: the murder or attempted murder of a head of state or head of government or a family member, and offenses both countries must prosecute under a multilateral international agreement.

If a question arises about whether an offense is political, the executive authority of the requested country decides.

In practice, this exception rarely helps in drug and fraud cases, but it remains part of the treaty and gets raised where charges have any political coloring.

Does Double Jeopardy Apply to Extradition?

Yes.

Article 6 of the treaty, the non bis in idem provision, prohibits extradition when the person has already been prosecuted, or has been tried and convicted or acquitted, in Mexico for the offense for which extradition is requested.

This defense matters when the conduct crossed the border, because Mexican prosecutors may have already pursued charges arising from the same operation.

When a relative has faced Mexican charges, the records from that proceeding belong in the extradition defense file, and Mexican counsel is positioned to pull them.

The protection runs to the specific offense in the extradition request, so the Mexican case and the U.S. charge have to be compared carefully rather than assumed to match.

Can the Statute of Limitations Block Extradition?

Yes.

Article 7 of the treaty, titled Lapse of Time, prohibits extradition when prosecution or punishment has become time-barred under the laws of either the requesting or the requested country.

That double-barreled rule means Mexican limitations law can defeat a U.S. request even when the U.S. charge is still timely, and the reverse is also true.

Limitations analysis in these cases gets technical fast, especially in conspiracy prosecutions, because the statute of limitations on federal drug conspiracy cases runs from the end of the conspiracy rather than from any single act.

Old conduct is not automatically safe conduct, and the limitations question deserves a hard look in every extradition file.

Can the Death Penalty or a Life Sentence Block Extradition?

A possible death sentence blocks extradition unless American prosecutors provide assurances Mexico considers sufficient that the death penalty will not be imposed or, if imposed, will not be carried out.

That rule comes straight from Article 8 of the treaty, and Mexican law does not permit capital punishment, so assurances are required in every potential capital case.

Life sentences have their own history.

In October 2001, Mexico’s Supreme Court held that life imprisonment is an unusual punishment prohibited by Article 22 of the Mexican Constitution, and the Law Library of Congress documented how that ruling forced U.S. prosecutors to give assurances against life sentences or see extradition denied.

In late 2005, the Mexican Supreme Court reversed course and lifted the ban on extraditing people who face life imprisonment, which reopened the pipeline for serious federal cases where life is on the table, including charges carrying mandatory minimum sentences.

Does Mexico Extradite Its Own Citizens?

Mexico can extradite its own citizens, but it is not required to.

Article 9 of the treaty provides that neither country is bound to deliver up its own nationals, while giving the executive authority the power to do so in its discretion if not prevented by its own laws.

If extradition of a national is refused, the treaty requires the requested country to submit the case to its own authorities for prosecution, so refusal does not mean the case disappears.

For decades the nationality provision made extradition of Mexican citizens rare, but practice shifted in the 2000s, and Mexican nationals are now surrendered regularly in serious cases.

Anyone counting on Mexican citizenship as a shield is relying on a discretionary call, not a guarantee.

What Is the Rule of Specialty?

The rule of specialty means the United States can detain, try, and punish an extradited person only for the offense for which Mexico granted extradition.

The U.S. Supreme Court recognized this doctrine in United States v. Rauscher, 119 U.S. 407 (1886), holding that an extradited person can be tried only for the offense on which the surrender was based.

Article 17 of the treaty codifies the rule and spells out the exceptions: the person left the requesting country and voluntarily returned, the person stayed more than 60 days after being free to leave, or Mexico consents to the new charges.

Article 17 also permits a change in how the offense is classified, but only if the new charge rests on the same group of facts and carries the same or a lesser maximum sentence.

One detail deserves attention before anyone signs anything in Mexico: under Article 18, a person who consents to summary extradition speeds up the surrender, and the treaty states that the rule of specialty does not apply in that situation.

That tradeoff between speed and protection should never be decided without legal advice on both sides of the border.

What Happens After Mexico Agrees to Extradite?

After Mexico grants the extradition, the two governments agree on a date and place of surrender, and deputy U.S. Marshals fly to Mexico to take custody and escort the person to the United States.

The Justice Manual describes this handoff: once foreign authorities notify the Office of International Affairs that the person is ready to be surrendered, agents, most often from the U.S. Marshals Service, escort the person back.

Under Article 14 of the treaty, if the person is not removed from Mexico within the time prescribed by Mexican law after the extradition order issues, the person must be set at liberty, and Mexico may refuse a second extradition for the same offense.

From the moment the plane lands, the case stops being an extradition matter and becomes a live federal prosecution, with the person moving through the federal criminal justice system after arrest.

Many of these prosecutions begin under seal, and families often learn the details only at this stage because sealed indictments and sealed arrest warrants hide the charges until the person is in custody.

What If the Person Also Has Charges or a Sentence in Mexico?

Mexico can grant the extradition and still hold the person until its own case ends.

Article 15 of the treaty allows the requested country to defer surrender while the person is being prosecuted or serving a sentence for a different offense, until the proceeding concludes or the punishment is fully served.

A protocol to the treaty signed in 1997, in force since May 21, 2001, amended Article 15 to permit temporary surrender, which sends the person to the United States for trial while the Mexican case is still pending and then returns the person to Mexico afterward.

For families, deferred surrender is often the answer to why an approved extradition has produced no transfer, because the Mexican sentence is running first.

Whether temporary surrender gets used is worked out between the two governments, so the timing question belongs with counsel rather than guesswork.

What Happens at the First Court Appearance?

The person must be taken before a federal magistrate judge without unnecessary delay for an initial appearance under Rule 5 of the Federal Rules of Criminal Procedure.

At that hearing, the judge confirms identity, informs the person of the charges, addresses the right to counsel, and sets the schedule for what comes next.

If the surrender flight lands outside the charging district, the person may first appear before a magistrate judge in the district of arrival and then be moved, sometimes sitting in county jails along the way under a U.S. Marshal hold.

Having U.S. counsel already retained before the plane lands means someone is standing in that courtroom on day one instead of scrambling on day three.

Will There Be a Detention Hearing?

Yes, in nearly every extradition case the government moves for detention, and the court decides release or detention under the Bail Reform Act, 18 U.S.C. section 3142.

The statute directs the judge to weigh the nature of the offense, the strength of the evidence, the person’s history and characteristics, ties to the community, and the danger posed by release.

Prosecutors argue that anyone who was just brought back from another country is a flight risk by definition, and in many drug cases the statute adds a presumption in favor of detention that the defense must rebut.

That argument can be answered with evidence: long residence in North Texas, family who appeared in court, documented reasons for time spent in Mexico, employment records, and a concrete release plan.

Building that record is slow work, which is exactly why the months while the relative is still in Mexico are valuable preparation time.

Can New Charges Be Added After Extradition?

Generally no, because the rule of specialty limits the prosecution to the offenses Mexico approved.

If the government wants to add charges based on different conduct, it generally needs Mexico’s consent under Article 17 or must fit within one of the treaty’s exceptions.

Specialty objections are raised in the U.S. court, and courts have heard them since Rauscher, so the indictment should be compared line by line against the Mexican extradition grant.

A superseding indictment in a federal drug conspiracy case deserves the same comparison, because conspiracy charges can quietly sweep in conduct beyond the surrendered offense.

How Is a Treaty Extradition Different From the 2025 and 2026 Mass Transfers?

Not everyone brought from Mexico to a U.S. courtroom in recent years was extradited under the treaty.

On February 27, 2025, the Department of Justice announced that 29 defendants were taken into U.S. custody from Mexico, and later DOJ announcements confirmed these mass transfers were carried out under Mexico’s National Security Law rather than through treaty extradition proceedings.

Those transfers followed the designation of Mexican cartels as terrorist organizations, a policy shift that changed the pressure surrounding these cases.

The table below compares the two paths a person can travel from Mexican custody to a U.S. courtroom.

For a person who arrived through a transfer rather than an extradition, whether specialty protection applies at all is an unsettled question that the defense should raise rather than assume away.

The charging limits, the available motions, and the negotiating posture all change depending on which path brought the person here, so the first task for U.S. counsel is pinning down exactly how custody was obtained.

One North Texas case shows both paths side by side.

In the Southlake murder-for-hire prosecution, Ramon Villarreal-Hernandez was extradited from Mexico in 2020, while his brother Jose Rodolfo Villarreal-Hernandez arrived through the February 2025 expulsion, and both ended up answering in the Dallas federal courts.

What Can Families in Texas Do While Their Relative Is Still in Mexico?

Families can use the months of the Mexican proceeding to put U.S. counsel in place, support Mexican counsel, and build the record that will decide the detention hearing.

Retaining U.S. counsel early means the lawyer can identify the charging district, obtain the indictment once unsealed, communicate with the assigned prosecutor, and be ready to appear the day the person arrives.

It also means Mexican counsel has an American counterpart, because decisions made in Mexico, like whether to consent to summary extradition, have direct consequences in the U.S. case that Mexican counsel cannot evaluate alone.

Families should start gathering detention hearing evidence now: proof of residence and employment, school and medical records, documentation explaining any travel to Mexico, and a list of family members willing to appear in court or serve as third-party custodians.

Two warnings belong here.

First, family members should never give a statement to law enforcement about the relative’s case, even in a friendly phone call, because anything said can be used in the prosecution, and the same caution applies if relatives themselves are being investigated by federal agents.

Second, calls into Mexican jails and later into U.S. detention facilities are recorded, so case details should move through counsel, not through phone calls.

Work on mitigating factors can also begin during this window, because sentencing preparation in federal court rewards an early start.

Need Help With an Extradition From Mexico to the United States?

Extradition from Mexico to the United States runs through the 1978 treaty, the Mexican courts, and the Secretariat of Foreign Relations, and then it becomes a federal prosecution the moment the person lands on U.S. soil.

The Mexican leg belongs to Mexican counsel, and the U.S. leg, from the initial appearance through the detention hearing, the specialty analysis, and trial or negotiation, belongs to a U.S. defense lawyer who knows this terrain.

Michael Lowe handles the U.S. side of Mexico extradition cases and works directly with Mexican counsel during the Mexican proceeding, and he has been board certified in criminal law by the Texas Board of Legal Specialization since 2007.

As an international extradition defense lawyer, Michael can prepare the U.S. case while your relative is still in Mexican custody.

Contact the Law Office of Michael Lowe today for a free initial consultation by calling 214-526-1900.

Frequently Asked Questions

How long does extradition from Mexico to the United States take?

Extradition from Mexico usually takes months and can take years. The timeline depends on how quickly the United States files its formal request, how busy the Mexican courts are, and whether the person challenges the decision in Mexico’s federal courts. The Department of Justice itself says predicting the time required is difficult because every case is different.

Can Mexico refuse to extradite its own citizens?

Yes. Article 9 of the 1978 treaty says neither country is required to hand over its own nationals, but the Mexican executive has discretion to do so. For years Mexico rarely extradited its citizens. Today Mexican nationals are extradited regularly, especially in serious drug trafficking cases, so citizenship alone is not reliable protection.

What is the rule of specialty in a Mexico extradition case?

The rule of specialty means the United States can only prosecute an extradited person for the offenses Mexico approved in the extradition. The U.S. Supreme Court recognized this rule in 1886, and Article 17 of the treaty codifies it. New or different charges generally require Mexico’s consent or a waiver under the treaty’s exceptions.

Does Mexico extradite people who face the death penalty or life in prison?

Mexico will not extradite anyone facing a possible death sentence unless American prosecutors give binding assurances that the death penalty will not be imposed or carried out. Life sentences blocked extradition between 2001 and 2005 under a Mexican Supreme Court ruling, but that decision was reversed, and life sentence cases can now proceed.

What happens at the first court hearing after someone is extradited to the United States?

The person appears before a federal magistrate judge without unnecessary delay after arrival. The judge confirms identity, explains the charges, addresses the right to counsel, and takes up the question of release or detention. The government almost always moves for detention in extradition cases, so the detention hearing is the first major fight on U.S. soil.

Can a person agree to be extradited from Mexico?

Yes. Article 18 of the treaty allows summary extradition when the person consents before Mexican authorities, which skips the full proceeding and speeds up surrender. There is a serious tradeoff. The treaty states that the rule of specialty does not apply in summary extradition, so consent should never be given without legal advice on both sides of the border.