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How Does The Extradition Process Work In Spain?

Extradition is one of the most complex and sensitive areas of international law. It involves a state surrendering an individual to another country to face criminal charges or serve a sentence.

Oct 24, 2025
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Extradition is one of the most complex and sensitive areas of international law. It involves a state surrendering an individual to another country to face criminal charges or serve a sentence. Spain, as part of the European Union and a signatory to multiple international treaties, follows a highly regulated legal framework when handling these cases. Understanding how the extradition process works in Spain is essential for anyone facing such a situation—or for those seeking clarity about how justice operates across borders.
The Spanish extradition system is grounded in both international treaties and domestic law. The main piece of legislation governing these procedures is the Spanish Extradition Act (Law 4/1985 of March 21), which sets out the general rules for surrendering or requesting individuals.
Spain also adheres to several international agreements, such as the European Convention on Extradition (1957) and various bilateral treaties with non-European countries. In the absence of a specific treaty, Spain can still consider extradition requests based on the principle of reciprocity—if both countries agree to cooperate.
The Ministry of Justice, the Ministry of Foreign Affairs, and the Audiencia Nacional (Spain’s High National Court) play key roles in these proceedings, ensuring that every step complies with Spanish law and international obligations.

Step-by-Step Extradition Procedure

The extradition process in Spain can begin in two ways: either another country requests Spain to surrender an individual (known as passive extradition) or Spain requests another country to hand over someone (known as active extradition). Let’s break down how the procedure unfolds in both scenarios.

1. The Request

When a foreign government asks Spain to extradite a person located on Spanish territory, the request must be formally submitted through diplomatic channels. This typically includes:
  • Identification of the person sought.
  • A copy of the arrest warrant or final judgment.
  • A summary of the facts, relevant laws, and applicable penalties.
The Spanish authorities review the documentation to ensure that it meets all legal requirements before forwarding it to the Audiencia Nacional.

2. Provisional Arrest

In urgent situations, a provisional arrest may occur before the formal extradition request arrives, especially when there’s a risk that the person might flee. This temporary detention is meant to prevent evasion while awaiting official paperwork from the requesting country.

3. Judicial Phase

Once the Audiencia Nacional receives the request, a magistrate evaluates it to verify that it complies with Spanish law and the relevant treaty provisions. The accused person is summoned to appear before the court and may present arguments against extradition, often with the help of extradition lawyerswho specialize in international defense.
During this phase, the court examines several key issues:
  • Whether the alleged crime is punishable in both Spain and the requesting country (the principle of double criminality).
  • Whether the offense is of a political, military, or religious nature (which could bar extradition).
  • Whether the person might face torture, inhumane treatment, or an unfair trial if surrendered.
After reviewing the evidence and arguments, the court issues a non-binding opinion on whether extradition should be granted.

4. Governmental Decision

The final decision lies with the Spanish Council of Ministers, which can approve or deny extradition based on legal and diplomatic considerations. Even if the court supports the request, the government may still refuse extradition for political, humanitarian, or national interest reasons.
If the extradition is approved, Spain coordinates with the requesting country to arrange the transfer. Conversely, if denied, the individual is released unless they face other charges in Spain.

Rights of the Requested Person

Throughout the process, the person sought for extradition retains specific rights under Spanish and international law. These include:
  • The right to legal representation and interpretation services.
  • The right to challenge the request before the courts.
  • The right to apply for asylum or protection against human rights violations.
Spain’s judiciary places strong emphasis on human rights guarantees. If the requesting country has a record of poor detention conditions, political persecution, or lack of fair trial guarantees, Spanish judges are likely to reject the extradition.
This approach aligns with Spain’s commitments under the European Convention on Human Rights and the Charter of Fundamental Rights of the European Union.

European Arrest Warrant vs. Traditional Extradition

It’s important to distinguish between traditional extradition and the European Arrest Warrant (EAW) system.
The EAW, in force since 2004, simplifies surrender procedures among EU member states. Instead of going through diplomatic channels, judicial authorities communicate directly. As a result, cases are resolved much faster—usually within 60 days.
However, the EAW still requires compliance with certain conditions, including proportionality and respect for fundamental rights. Spanish courts can refuse to execute a European Arrest Warrant if doing so would violate these principles.

Grounds for Refusing Extradition

Spain can refuse extradition under several circumstances:
  • The person is a Spanish national, since Spain generally does not extradite its own citizens.
  • The offense is political or military, rather than criminal.
  • The individual has already been tried or acquitted for the same offense (ne bis in idem principle).
  • There is a serious risk of human rights violations in the requesting country.
In some cases, Spain may choose to prosecute the individual domestically instead of extraditing them, especially when the alleged crime affects Spanish interests.
Given the legal and diplomatic complexity of these procedures, having experienced counsel is crucial. Individuals facing extradition proceedings should seek immediate assistance from specialized extradition law firmswith a deep understanding of both Spanish and international criminal law.
These professionals can challenge procedural flaws, negotiate with authorities, or even file appeals before higher courts and the European Court of Human Rights.

Final Thoughts

Extradition in Spain is far more than a bureaucratic exchange between countries—it’s a judicial process rooted in fairness, legality, and human rights protection. Whether Spain is the requesting or the requested state, the procedure balances international cooperation with individual safeguards.
For anyone involved in such proceedings, the guidance of skilled extradition lawyers can make a decisive difference in navigating the legal system and ensuring that justice is properly served.
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