Preventive defense against extradition requests, international arrest warrants, and criminal cooperation between Spain and the United States.

A federal investigation in the United States rarely provides advance notice. When a businessperson with operations, accounts, or partners on the other side of the Atlantic discovers there's an indictment or an arrest warrant against them, the clock has already started ticking — and, frequently, it's been ticking for a while without them knowing.

For those with assets, businesses, or simply international mobility, an extradition request is not a distant or abstract problem. Criminal cooperation between Spain and the United States is one of the most active in the world, especially in economic crimes: fraud, money laundering, transnational corruption, or violations of US regulatory frameworks. A trip, an air layover, or a bank account can, from one day to the next, become the point of contact with a judicial machinery that operates on a global scale.

The good news is that extradition is not automatic. It's a regulated procedure, with solid constitutional and conventional guarantees, and real spaces for defense. The difference between one outcome and another is almost never about luck: it's about when you act and with what strategy. And the best time to act is formerly from the arrest, not after.

Yes, there is an extradition treaty between Spain and the United States.

Yes, and it's one of the most consolidated bilateral frameworks that Spain has. It's not a single text, but a network of instruments that have been superimposed over the past half-century:

• The Extradition Treaty of May 29, 1970 (Official Gazette No. 220, of September 14, 1971), which is the parent regulation.
• The Supplementary Treaty of January 25, 1975 (Official State Gazette of June 27, 1978).
• The Second Supplementary Treaty of February 9, 1988 (Official State Gazette of July 1, 1993).
• The Third Supplementary Treaty of March 12, 1996 (Official State Gazette of July 8, 1999).
• And the Instrument provided for in Article 3(2) of the Extradition Agreement between the European Union and the United States of June 25, 2003 (Official State Gazette of January 26, 2010), which incorporated this bilateral framework into the EU-U.S. cooperation system.

For those affected, this seemingly technical detail has a major practical implication: each of these instruments amended specific articles of the original treaty. A sound defense does not argue about «the treaty» in the abstract, but rather about the current and consolidated version Knowing what reform each protocol introduced—and what the applicable text is today—is the first area where time is gained or lost.

For what crimes can the United States request my extradition?

The treaty works on a logic of dual criminalityExtradition is only granted when the act is punishable in both countries with a custodial sentence of more than one year. The catalog is extensive and includes, among others, economic and property crimes: fraud, embezzlement, misappropriation of funds, fraudulent acquisition of funds, document forgery, bribery, or money laundering.

Here it is important to be clear: not every U.S. indictment, however serious it sounds, fits without further ado into an extraditable category according to Spanish law. And not every legal classification made by a foreign prosecutor can withstand comparison with the equivalent Spanish criminal offense. That comparison is precisely one of the first lines of defense.

What is double jeopardy and why is it my first line of defense?

Dual criminality requires the conduct to be criminal in Spain and the United States at the relevant time. It is not enough for a position to exist in the United States; that position must have a genuine equivalent in the Spanish legal system.

In practice, many concepts in U.S. criminal law—based on ideas such as conspiracy, wire fraud Federal types of very open configuration— are not mechanically transferred to the Spanish Penal Code. Rigorously analyzing whether the specific act, stripped of its foreign label, constitutes a crime in Spain is a delicate technical task that can lead to the inadmissibility of the request.

One point worth noting: the Third Supplementary Treaty of 1996 introduced a rule that limits a classic defense argument. Today, extradition may be granted even if the criminal action or the penalty were time-barred under Spanish law, with the requesting party’s declaration that the claims have not expired under its own law being sufficient. This is an example of why working with an outdated text leads to serious errors: the statute of limitations, which for years served as a defensive barrier, no longer operates in the same way within this bilateral framework.

Common mistakes that complicate an extradition proceeding

Experience shows that damage is often not caused by the request itself, but by the precipitate reaction of the recipient. The most costly mistakes are usually:

• Wait to seek advice until after being arrested. The procedure can be prepared much earlier, when there is still room to maneuver.
• Traveling without an updated risk map. An international arrest warrant can be executed at any border; traveling without realizing the risk you face is the most common—and most avoidable—mistake.
• To speak with authorities without specialized technical assistance. An off-the-cuff statement can set a precedent that subsequently influences the entire proceedings.
• Treat the problem as purely local. A U.S. indictment typically has simultaneous ramifications—migratory, financial, reputational—in multiple jurisdictions at once.

How does the extradition process work in Spain?

When Spain receives a request (which is technically referred to as passive extradition), the procedure is governed by the bilateral treaty and by the Law 4/1985, of March 21, on Passive Extradition. It develops, in essence, in two phases:

1. Initial governmental phase. The Government decides whether the application proceeds to the judicial phase.
2. Judicial phase. Learn about the Criminal Chamber of the Audiencia Nacional, which examines whether the legal and conventional requirements for the extradition are met. If the National Court denies extradition, that decision is binding: there is no handover.
3. Final government decision. If the National High Court deems it appropriate, the Council of Ministers makes the final decision, and it can still deny it for reasons of sovereignty, security, public order, or other essential state interests.

It's a dual-key system with an asymmetry favoring the claimant: two "yes" votes are needed to deliver, while just one "no" at either level is sufficient to not deliver.

Provisional detention and the 45-day period

In cases of emergency, the United States may request the provisional detention of the claim even before formalizing the complete application. The Supplementary Treaty of 1975 set a relevant guarantee: if after forty-five days Since the notification of the arrest through diplomatic channels did not include the formal extradition request with all its documentation, the person must be released.

That deadline is not a formality. It is a window—narrow, but real—where a prepared defense can act decisively.

What guarantees and limitations protect me against extradition?

Here lies the heart of the defense. The Spanish and international framework offers limits that no treaty can surpass:

• No extradition for political offenses. The treaty itself excludes extradition when the offense is political in nature, or when there are reasonable grounds to believe that the request seeks to punish the person on grounds of that nature (Article 5). It is the space where the misuse of criminal proceedings for persecution—the so-called lawfare—.
• Guarantees against the death penalty. When the offense is punishable by capital punishment in the U.S., the treaty (Article 7) prohibits extradition unless sufficient assurances are provided that such penalty will not be imposed or carried out.
• Principle of specialty. The person surrendered cannot be judged for offenses other than those for which extradition was granted.
• Constitutional coverage. Article 13.3 of the Spanish Constitution conditions all extraditions on treaties and laws, under the principle of reciprocity.
• The threshold of Article 3 of the European Convention on Human Rights. Spain, as a party to the ECHR, cannot extradite a person if there is a real risk that they will suffer torture or inhuman or degrading treatment. Since the landmark ruling Soering v. United Kingdom (1989), the European Court of Human Rights established that the conditions awaiting the respondent in the requesting country—including the so-called death row phenomenon—can, in themselves, prevent extradition.

These limits are not invoked with a phrase: they are constructed with proof, with knowledge of the requesting system, and with a pre-prepared argumentation structure.

What can I do preventatively, before the problem erupts?

The most effective defense is one that is designed before the first arrest. In practice, this means:

• Evaluate the actual exposure to investigations in the United States and to possible international alerts, including INTERPOL broadcasts.
• Mapping mobility risk: What jurisdictions are safe, which are not, and with what guarantees do you travel?.
• Anticipate documentary and evidentiary strategy, so that, if a request comes in, the response is already articulated and not improvised under pressure.
• Coordinate the reputational dimension, because in high-profile situations, reputational damage usually precedes and outweighs strictly legal damage.

Prevention is not about evading justice, but about ensuring that if proceedings are initiated, the person faces them from a position of control and with all safeguards in their favor.

Yes, and it almost always starts by acting in time.

The most frequently asked question during the first contact is also the most human: Is there a solution to this? The honest answer is that, in the vast majority of well-managed cases, Yes, there is room.. Unadmissible requests due to lack of double jeopardy; Denied deliveries due to the risk of infringement of fundamental rights; procedures redirected thanks to adequately negotiated diplomatic assurances; situations defused in the preventive phase before they materialized into an arrest. These are real scenarios, which are always handled confidentially due to discretion.

What those cases have in common is not luck. It's having acted with judgment, with knowledge of the applicable framework, and with a strategy designed from the outset.

A defense designed for transnational scenarios

In extradition and international criminal cooperation proceedings, simultaneous coordination between European and Latin American jurisdictions is often crucial for building an effective defense strategy from day one. The same case may require, at the same time, acting before the National High Court in Madrid, monitoring an alert through INTERPOL channels, and understanding in real-time what is happening in the requesting system.

Tackling this complexity requires a structure capable of operating in a coordinated manner across multiple locations. Through a network of correspondents and allied firms present in around fifteen jurisdictions—including Portugal, Andorra, France, the United Kingdom, Belgium, Colombia, Panama, the Dominican Republic, the United States, Singapore, and Dubai, in addition to established alliances with top-tier firms in Switzerland—it is possible to articulate a unified legal response wherever the case demands it, without losing the strategic coherence or discretion that these matters require.

Conclusion: The time to prepare is now

An extradition request from the United States is one of the most impactful legal scenarios an entrepreneur or a person with international assets can face. It puts freedom, assets, and reputation at stake simultaneously.

But it is, above all, a procedure with rules, with safeguards, and with possible defense. The decisive variable is not the severity of the charge: it is anticipation. Those who understand their exposure and prepare their strategy before arrest face the process from a radically different position than those who react once they are already in custody.

If you, your company, or your family have exposure to international investigations, the prudent step is a confidential and early legal assessment of your situation. Not to alarm you, but to give you control.

Frequently asked questions

Does Spain extradite its own nationals to the United States? The treaty does not obligate the extradition of its own nationals, but it allows the competent authority to do so if it deems it appropriate. It is, therefore, a faculty and not an obligation, which opens up a relevant margin of defense for Spanish citizens.

Can I be stopped at an airport on a U.S. warrant? Yes. An international arrest warrant can be activated when crossing a border. That is why mobility risk assessment is one of the first preventive measures that should be taken.

How long can an extradition procedure last in Spain? It depends on its complexity and the resources involved, but it can extend for months. There are specific deadlines--such as the forty-five days to file the formal application after provisional arrest--whose technical control is essential.

If I'm investigated in the United States, should I wait to receive a request to act? No. The most valuable phase of a defense is usually the preventive one, before there's an arrest. Waiting drastically reduces the available options.

Is there a warning about INTERPOL Is this equivalent to an extradition? No. An INTERPOL diffusion or notice is a mechanism for locating and police cooperation, not an arrest warrant for extradition. However, it can be the first sign of an extradition risk and should be handled with the same seriousness.

VENFORT Lawyers | International Defense Against Extradition and Criminal Cooperation

In matters originating from a US federal investigation, understanding the requesting system is as crucial as mastering Spanish procedure. That's why VENFORT Lawyers works constantly and in coordination with ultra-specialized firms in the locations where federal criminal action is concentrated in the United States—New York, Houston, Miami, and Washington D.C.—, allowing the strategy to be anticipated from both sides of the process and to act with a single line of defense, coherent and discreet.

From our offices at Madrid and Caracas, and through a network of correspondents in around fifteen jurisdictions in Europe, the Americas, and Asia, we articulate a unified legal response for entrepreneurs, executives, family offices, and individuals with international exposure.

If you need a confidential assessment of your situation, you can request one private consultation. Discretion and anticipation are, almost always, the best defense. Contact us today here.

This article is for informational purposes only and does not constitute legal advice for a specific case. Each situation requires an individualized and confidential analysis.