When a foreign country asks Spain to hand over a person located on Spanish soil, a specific legal process is set in motion. Spain becomes the requested State and must decide, under its own law and the applicable treaties, whether the surrender is legally justified. Understanding how that process unfolds is the first step for anyone facing an international request while in Spain.
The legal framework
Extradition from Spain, known as passive extradition, is governed by Law 4/1985 of 21 March, by the international treaties Spain has ratified, and by Article 13.3 of the Spanish Constitution. A central rule runs through the whole system: extradition is only granted on the basis of reciprocity, meaning the requesting State must offer equivalent guarantees. Where a treaty exists, its provisions take precedence; where none applies, the law remains the reference point. Spain has signed extradition treaties with countries of very different legal traditions, which is why the applicable instrument must be checked at the outset of every case.
How a case usually begins
Many cases start with an INTERPOL red notice, which is not an arrest warrant in itself but an international alert asking authorities to locate and provisionally detain the person. It does not establish guilt, and it can be challenged before INTERPOL where it is politically motivated or otherwise abusive. From there, the matter moves through an initial governmental stage and a judicial stage before the Audiencia Nacional, the court responsible for verifying whether the legal requirements are met.
The stages of the procedure in detail
The judicial phase is where most of the defence work takes place. The court examines whether the formal and substantive conditions are satisfied, hears the person concerned and rules on the request. Its decisions can be appealed before the full chamber. Crucially, even if the court finds the surrender admissible, the final decision rests with the Government, which may still refuse it on grounds connected to sovereignty, security or public order. This blend of judicial control and executive discretion is one of the defining features of the Spanish system.
Requirements and grounds to challenge the request
Surrender generally requires dual criminality, so the conduct must be an offence in both the requesting country and Spain, together with a minimum threshold of seriousness tied to custodial penalties. Several grounds can be raised against the request: the absence of dual criminality, the political nature of the offence, the statute of limitations, a prior final judgment for the same facts, the risk of persecution on grounds of race, religion, nationality or political opinion, and any real threat to the person’s fundamental rights or to a fair trial in the requesting State. A close analysis of that country’s judicial and prison system is often the core of the defence.
The rule of specialty and what surrender means in practice
The rule of specialty ensures that a person who is surrendered can only be tried for the offences on which the request was based, not for earlier, unrelated matters. This matters because surrender is never a neutral step: it means being subjected to a different penal system, with penalties, prison conditions and procedural guarantees that may differ significantly from the Spanish ones. Assessing those consequences in advance is part of building a realistic strategy.
Why timing and specialisation matter
Deadlines in extradition cases are short, and the documentation submitted by the requesting country must be reviewed immediately. Experienced extradition lawyers know which formal defects to raise, what information to request from the requesting State and how to structure each ground of opposition so that it reinforces the others. Acting early, rather than reacting once positions have hardened, is decisive.
The role of treaties and reciprocity
Treaties are the backbone of extradition. Where Spain has signed an extradition treaty with the requesting country, its terms set the conditions, the offences covered and the grounds for refusal, and they take precedence over the general law. Where no treaty applies, cooperation rests on reciprocity, the understanding that Spain will assist on the basis that the other State would do the same in return. Identifying which of these situations applies is one of the first things a defence must establish, because it shapes every argument that follows.
What to expect during the case
A person facing extradition from Spain can expect a procedure that unfolds in stages, with hearings before the Audiencia Nacional and, where appropriate, an appeal. It is not unusual for these cases to take time, and the question of whether the person waits in custody or at liberty is often decided early on. Understanding this rhythm in advance helps to plan the defence and to avoid the frustration of expecting a quick resolution where none is realistic.
The first hours after a red notice
The hours immediately after a detention often set the tone for the whole case. On being detained, the person is entitled to be told why, to remain silent, to the assistance of a lawyer and, where necessary, to an interpreter. It is also the point at which provisional detention is first considered, so arguments about ties to Spain and the absence of any flight risk may need to be made straight away. The most common mistake at this stage is to give explanations or sign documents without advice, in the belief that cooperation will speed things up. In extradition, early statements can narrow the options later, which is why the safest course is to say little until the situation has been assessed with a specialist.
Conclusion
Extradition from Spain is a structured procedure in which the country weighs its international commitments against the protection of the requested person’s rights. Knowing the requirements, the stages and the grounds for refusal is the starting point of any defence, and securing specialist representation from the outset is the best safeguard against a surrender that may not be legally justified.