International Extradition: Treaties, § 3181, and the Secretary of State

International extradition is a two-step process. Under 18 U.S.C. § 3184 a U.S. judge holds a hearing and, if the evidence satisfies the treaty, certifies that the person is extraditable — but does not order surrender. The Secretary of State then makes the final, discretionary decision under § 3186. A treaty is required by § 3181.

The treaty requirement (§ 3181)

International extradition begins with a treaty. Under 18 U.S.C. § 3181, extradition from the United States to a foreign country is authorized only during the existence of an extradition treaty with that government. No treaty, no ordinary extradition — which is why the first question in any international case is whether a treaty covers both the country and the specific offense.

Section 3181 does carry one narrow, non-treaty exception. It permits the Attorney General to certify the surrender of a person who is not a U.S. citizen or permanent resident and who has committed a violent crime against a U.S. national abroad, subject to conditions including that the offenses are not of a political nature. That exception is limited and rarely the path; for almost every case, the treaty framework governs. This is a federal process handled in the U.S. district courts — a very different track from Texas's interstate Uniform Criminal Extradition Act procedure, which moves fugitives between U.S. states.

The two-step structure: judge, then Secretary

The defining feature of U.S. international extradition is that the decision is divided between the judicial and executive branches. A court decides only whether the legal prerequisites are met and certifies that finding. The Secretary of State then decides, separately and in discretion, whether the United States will actually hand the person over. Understanding which official does what is the key to the whole process.

In practical terms, a favorable result at either stage can stop a surrender. A person may lose the judicial hearing but still persuade the Secretary of State to decline surrender or to demand assurances; conversely, defeating extraditability before the judge ends the matter without the Secretary ever reaching it. Because the two stages ask different questions, the defense strategy in each is different — legal and evidentiary before the judge, and often humanitarian, diplomatic, or policy-based before the Secretary.

The § 3184 hearing & certification

The judicial stage runs through 18 U.S.C. § 3184. On a complaint charging a treaty-covered offense, a judge or magistrate judge issues a warrant, holds a hearing, and evaluates whether the evidence is sufficient to sustain the charge under the treaty. If it is, the court certifies extraditability — together with a copy of all the testimony — to the Secretary of State and commits the person to await surrender.

The hearing is not a trial. The judge does not decide guilt or innocence. The questions are whether the offense is one provided for by the treaty, whether there is competent evidence establishing probable cause, whether dual criminality is satisfied, and whether the person before the court is the person sought. Critically, the court's role ends at certification: the judge does not order the person surrendered. That power belongs to the executive. A § 3184 certification is most accurately understood as a legal green light that the Secretary of State is then free to act on — or not.

The Secretary of State's surrender warrant (§ 3186)

Once a court certifies extraditability, the file moves to the executive branch. Under 18 U.S.C. § 3186, the Secretary of State may order the committed person delivered to the requesting government's authorized agent for trial or punishment. The statute uses the permissive word “may” deliberately: even after a judge finds a person extraditable, surrender is discretionary.

That discretion is where humanitarian and diplomatic considerations enter. The Secretary may decline surrender, or condition it on assurances from the requesting country — most prominently, an assurance that the death penalty will not be sought or carried out where the charged conduct is capital-eligible abroad. The specific content of any such assurance is treaty- and case-specific, and the review of the Secretary's ultimate decision is extremely narrow. The takeaway for anyone facing an international request is that certification by a judge is not the end of the road, and the executive stage carries its own, quite different, avenues.

Core doctrines: dual criminality, specialty, political offense

Three doctrines run through virtually every international extradition case. They are treaty-based principles, applied through the § 3184 inquiry, and each can be decisive on the right facts.

Dual criminality

The conduct must be a crime in both the requesting country and the United States, typically also meeting a minimum-penalty threshold. It is a standard feature of modern U.S. extradition treaties and is applied under § 3184's requirement that the offense be one provided for by the treaty. If the alleged conduct is not criminal on both sides, extradition is generally refused.

Rule of specialty

A surrendered person may be tried only for the offense or offenses for which extradition was actually granted, absent the surrendering state's consent to broader charges. The Supreme Court recognized this treaty-based doctrine in United States v. Rauscher, 119 U.S. 407 (1886). It prevents a requesting country from using one charge to obtain a person and then prosecuting unrelated ones.

Political-offense exception

Extradition is generally refused for offenses of a political character — a standard clause in U.S. treaties, referenced in 18 U.S.C. § 3181(b). Courts distinguish genuinely political acts from ordinary crimes, and the exception is narrower in practice than it sounds; its availability is heavily fact- and treaty-specific.

Alongside these, the Secretary of State's humanitarian discretion — including death-penalty assurances — functions as a fourth safeguard operating at the executive stage rather than in the courtroom. None of these principles is an automatic defense; each is a doctrine whose application depends entirely on the treaty text and the facts.

The § 3188 two-month rule & citizens (§ 3196)

Two additional statutes matter in practice. One controls timing after commitment; the other addresses whether the United States can surrender its own nationals. Both sit within the same §§ 3181–3196 chapter as the hearing and surrender provisions.

Under 18 U.S.C. § 3188, if a person committed for surrender is not actually delivered and conveyed out of the United States within two calendar months after commitment — over and above the time reasonably needed for travel — a federal or state judge may, on application and after notice to the Secretary of State, order the person discharged, unless sufficient cause is shown for the delay. It is a check against indefinite detention while the executive sits on a certified case.

On citizenship, 18 U.S.C. § 3196 provides that even when a treaty does not obligate the United States to extradite its own citizens, the Secretary of State may nevertheless order the surrender of a U.S. citizen if the treaty's other requirements are met. Whether that happens turns on the particular treaty and the Secretary's discretion — being a U.S. citizen is not, by itself, a bar to surrender.

Habeas, not appeal: the limited review

A § 3184 certification cannot be appealed the way an ordinary judgment can. The only avenue to challenge it in court is a petition for a writ of habeas corpus, and even that review is deliberately narrow — it is not a second bite at the merits.

On habeas, courts have traditionally limited the inquiry to whether the magistrate had jurisdiction, whether the offense charged is within the treaty, and whether there was any competent evidence supporting the extradition finding. Guilt or innocence is not on the table, and the reviewing court does not reweigh the evidence. Because the review is so constrained, the § 3184 hearing itself is where the real contest happens — identity, treaty coverage, dual criminality, and the sufficiency of the requesting country's showing all have to be litigated there, not saved for a later stage that will not reach them.

Interstate vs. international extradition

People often conflate the two extradition systems, but they operate under entirely different law. Interstate extradition moves a fugitive between U.S. states under the Constitution's Extradition Clause and the Uniform Criminal Extradition Act; international extradition moves a person to a foreign sovereign under a treaty and Title 18. The table below maps the key differences.

For the state-side mechanics — Governor's Warrants, waiver, the fugitive hold, and the habeas hearing — see the Texas extradition hub. If a person is already in federal or state custody and another sovereign has lodged a hold, the closely related question of federal detainers and the Interstate Agreement on Detainers may control how and when they are moved.