Extradition follows a court check, a government decision and a custody transfer

How does extradition work? A government asks another jurisdiction to hand over a person wanted to face prosecution or serve a sentence. The requested jurisdiction can arrest the person, test the request in a legal process, and then decide whether to surrender them. It is a formal government process, not a private way to bring someone back.

The details can change sharply with the countries or U.S. states involved. International cases commonly run through a court phase and an executive-government phase, while transfers between U.S. states rest on a separate constitutional and statutory framework.

How does extradition work when someone is in another country?

International extradition begins with two sides: the requesting country, where the person is wanted, and the requested country, where that person has been found. The purpose can be a criminal prosecution or enforcement of a sentence after conviction, according to the U.S. Justice Department’s extradition guidance.

For the United States, international extradition is treaty-based. That means the United States needs an extradition treaty with the other country before it considers a request. The applicable treaty and the law of the requested country set the rules that matter in a particular case.

1. Prosecuting authorities start the request. Private individuals cannot initiate an international extradition request. A prosecutor typically acts after charges have been filed and an arrest warrant has issued. When U.S. authorities seek someone abroad, the Justice Department’s Office of International Affairs works with the prosecutor, and the State Department presents the request through diplomatic channels.

2. The requested country receives materials and may arrest the person. In the process for a foreign government seeking extradition from the United States, the submission generally includes treaty-required paperwork, often such items as details about the person, alleged offenses, charging documents, arrest warrants and evidence. A requesting government may seek a provisional arrest and detention while it assembles the full material if it believes there is a flight risk.

3. A court checks legal eligibility. The court in the requested country examines whether the request meets the governing treaty and that country’s law, then decides whether extradition is legally available. The precise test varies by jurisdiction.

4. An executive authority makes a surrender decision. If the court allows the case to proceed, a government official in the requested country may decide whether the person will actually be surrendered. In the United States, that authority is the Secretary of State.

5. Authorities arrange the handover. Once surrender is approved and the requested country is ready, authorities coordinate a transfer of the person in custody to the requesting jurisdiction.

That sequence describes a common model, not a one-size-fits-all rulebook. Judicial rulings and executive decisions can be subject to appeals depending on the country involved.

What does the court decide, and what does it leave for later?

An extradition hearing is a gatekeeping proceeding, not necessarily the later criminal trial. The court asks whether the legal conditions for surrender have been met under the treaty and local law. The underlying criminal case is ordinarily prosecuted in the jurisdiction seeking the person.

The U.S. process for a person sought by a foreign country shows the distinction. The State Department decides whether to send the request to the Justice Department; DOJ reviews treaty compliance, obtains an arrest warrant and brings the person before a federal judge or magistrate. The court decides whether probable cause supports an offense covered by the treaty. As the Council on Foreign Relations describes that U.S. certification procedure, it is not a trial-style independent evaluation of the evidence. If the court certifies extradition, the Secretary of State has the final decision described in that process.

Treaties often ask whether the alleged conduct is punishable in both places. This is called dual criminality. Newer treaties commonly use that approach, while older ones may list the specific offenses covered. Some treaties also limit extradition to offenses meeting a specified level of seriousness.

Other possible barriers depend on the agreement and local law. The UK’s published rules for certain cases, for example, list double jeopardy, improper motivation, passage of time, proportionality and compatibility with human rights among issues a court may consider. Those are a useful illustration of why a request can involve more than an arrest warrant, but they are not a universal checklist.

Can someone challenge an extradition request?

Often, yes. The available challenge and appeal routes depend on the requested jurisdiction. The Justice Department says both the judicial ruling and the executive surrender decision may be open to multiple levels of appeal in some countries.

In one jurisdiction-specific example, UK Home Office guidance for category 1 cases sets out a warrant, certification, arrest, initial hearing and extradition hearing. A judge considers whether the conduct is an extradition offense and whether statutory bars apply. The requested person and the requesting state can seek permission to appeal to the High Court under that system.

That is why no headline can accurately promise a fixed extradition timetable. The Justice Department says international extradition can take many months or years. When the United States has requested someone abroad, foreign courts and authorities control the pace once the request is submitted. Arrest, court review, executive consideration and any available appeals are separate procedural stages that a case may have to pass through.

Is an Interpol Red Notice the same as extradition?

No. A Red Notice is an international alert circulated through Interpol at the request of a member country that has a valid arrest warrant or court order. It can flag a wanted person to police and border agencies around the world.

Each member country retains discretion on whether to arrest the person and begin extradition proceedings. A Red Notice, or an arrest following one, does not resolve the later court review or executive surrender decision. It also does not decide the criminal accusation.

An arrest and the next steps can bring questions that look familiar from a domestic criminal case, including detention and release. For that separate subject, see our guide to how bail works after an arrest.

How is extradition between U.S. states different?

State-to-state extradition, often called interstate rendition, is a different track from international extradition. The state seeking the person is the demanding state. The state where the person is found is sometimes called the asylum state.

According to Pennsylvania’s Office of General Counsel, interstate rendition is governed by the U.S. Constitution’s rendition clause, a federal statute and state law. That framework covers transfers between states and between a territory or district and a state. It does not govern transfers between a state and the federal government.

The constitutional extradition framework includes treason, felonies and other crimes, including misdemeanors, the Pennsylvania guidance says. States have their own procedural requirements, but must meet the federal baseline. A Uniform Criminal Extradition Act-style process can provide for arraignment, an opportunity to petition for habeas corpus and detention while governors issue the required paperwork.

A person may therefore be returned across a state line through an interstate process without the treaty analysis that anchors U.S. international extradition. Neither track erases the underlying criminal case. It determines which jurisdiction may take custody and proceed with it.

The practical takeaway

Extradition is a chain of official decisions: a prosecutor’s request, possible arrest, legal review, an executive surrender choice and a custody transfer. Treaties and local law shape international cases; the federal rendition framework shapes state-to-state cases. The fastest way to understand a real case is to identify where the person is, who wants them, and which legal system controls the request.

Frequently asked questions

Can a country extradite someone without a treaty?

For the United States, the Justice Department says international extradition is treaty-based, so the United States must have an extradition treaty with the requesting country to consider the request. Procedures elsewhere vary. UK guidance says special extradition arrangements may be possible even when the UK has no arrangement or treaty with a particular territory.

Can a person appeal an extradition decision?

It depends on the country, but appeals may be available. The U.S. Justice Department says judicial and executive extradition decisions can be subject to multiple appeal levels depending on the country. In the UK category 1 process, either the requested person or requesting state may seek permission to appeal to the High Court.

How does extradition between U.S. states differ from international extradition?

Interstate rendition is governed by the U.S. Constitution, federal statute and relevant state law, rather than an international treaty. One state, the demanding state, seeks the return of a person found in another, the asylum state. The framework covers criminal offenses including misdemeanors, according to Pennsylvania’s Office of General Counsel.

Does an Interpol Red Notice mean someone will be extradited?

No. A Red Notice is an alert to police and border agencies, requested by an Interpol member country with a valid arrest warrant or court order. Each country decides whether to arrest the person and start extradition proceedings, which still require later legal and government decisions.