A country can refuse an extradition request on several recognized grounds: no treaty exists, the offense is too minor or not criminal in both countries, the charge is political, prosecution is time-barred, the person has already been tried for the same conduct, surrender would expose them to torture or an unfair trial, the death penalty is on the table without assurances, or the person is a national of the requested country. Each of these is independent, and a single valid objection is enough to stop the transfer. The grounds for refusing extradition apply whether you are the person named in a request, a family member, or someone trying to make sense of a case in the news.
No Treaty in Force
The first question in any U.S. case is whether a treaty exists with the requesting country. Federal law limits the extradition framework to situations where a treaty is in place, with a narrow exception for non-citizens accused of violent crimes against U.S. nationals abroad.1Office of the Law Revision Counsel. 18 USC 3181 – Scope and Limitation of Chapter The countries with which the U.S. maintains extradition treaties are listed in the notes to that statute.
If no treaty governs the relationship, the United States generally has no obligation to hand anyone over, and that fact alone ends the matter. The same logic applies in reverse when the U.S. asks another country to surrender someone.
The Offense Is Too Minor
Treaties do not reach every crime on the books. Most require the alleged offense to carry a minimum potential sentence under the laws of both countries, typically at least one year of imprisonment. The UN Model Treaty on Extradition reflects this standard, defining extraditable offenses as those punishable by at least one or two years of imprisonment depending on the treaty.2United Nations Office on Drugs and Crime. Revised Manuals on the Model Treaty on Extradition Petty theft, simple trespass, and low-level regulatory violations usually sit below the threshold.
When the request is to enforce a sentence that has already been imposed rather than to prosecute a new case, many treaties add a second requirement: a minimum amount of time must still remain on the sentence, often four to six months. If the person is nearly finished serving, that alone can defeat the request.
The Conduct Is Not a Crime in Both Countries
Dual criminality is one of the most fundamental grounds for refusal. The conduct underlying the charges must be a crime in both countries. If the behavior the requesting country wants to prosecute is lawful where the person is located, the request fails.
Under U.S. law, the judge at the extradition hearing must decide whether the evidence would support the charge if the conduct had occurred locally.3Office of the Law Revision Counsel. 18 USC 3184 – Fugitives From Foreign Country to United States Courts look at the actual conduct rather than at the label the foreign country uses. Someone accused of “misappropriation of funds” abroad is evaluated by whether the specific actions would amount to theft or embezzlement at home. The labels do not need to match; the behavior does.
A business practice that is standard commercial activity in one country but criminalized in another is a classic example. The rule keeps a country from being drafted into prosecuting conduct its own laws permit.
Political Offense Exception
A country can refuse extradition when the alleged crime is fundamentally political rather than ordinary criminal conduct. The doctrine distinguishes two categories.
“Pure” political offenses are acts directed solely against the government itself: treason, sedition, espionage, and similar conduct. These lack the elements of ordinary crimes and are excluded from extradition in virtually every treaty.
“Relative” political offenses are ordinary crimes committed during and in connection with a political uprising. Courts apply the “incidence test,” asking whether the act occurred during genuine political unrest and was committed to advance a specific political objective.
Modern treaties have narrowed this ground considerably. Violence targeting civilians does not qualify, regardless of political motive. In Eain v. Wilkes (1981), a court rejected a political offense claim arising from a bombing in a civilian area, holding that indiscriminate attacks on civilians lack the required link to political objectives. The International Convention for the Suppression of Terrorist Bombings reinforces this by stating that none of the offenses it covers can be treated as political offenses for extradition purposes.4University of Minnesota Human Rights Library. International Convention for the Suppression of Terrorist Bombings
The Statute of Limitations Has Run
Extradition can be refused when too much time has passed to prosecute or punish under the laws of either country. Many treaties treat this as a mandatory bar.
The UN Model Treaty on Extradition provides that extradition “shall not be granted” when the person has “become immune from prosecution or punishment for any reason, including lapse of time or amnesty” under the law of either country.5United Nations Office on Drugs and Crime. Model Treaty on Extradition Regional agreements follow suit. The Inter-American Convention on Extradition bars surrender when “the prosecution or punishment is barred by the statute of limitations according to the laws of the requesting State or the requested State prior to the presentation of the request.”6Organization of American States. Inter-American Convention on Extradition
Some treaties look only at the requesting country’s limitations period; others consider both. The specific language of the treaty in play controls which approach applies, so delay by the requesting country can become an absolute defense.
Double Jeopardy, Pardons, and Amnesty
The principle of double jeopardy, known in international law as ne bis in idem, prevents a second trial for the same conduct. If someone has already been tried, convicted, or acquitted for the offense in the requested country, that country will refuse to surrender them for another prosecution. Many bilateral treaties extend this protection to final judgments reached in a third country as well.
Judges compare the facts of the earlier case with those in the new request. Different victims, separate incidents, or genuinely distinct conduct can mean the bar does not apply. For a single criminal act that has already gone to trial, the outcome of that trial typically ends any extradition request for the same behavior.
Pardons and amnesties can also block surrender. The UN Model Treaty groups amnesty with lapse of time among the mandatory grounds for refusal when the person has become immune from prosecution “for any reason.”5United Nations Office on Drugs and Crime. Model Treaty on Extradition Whether a foreign pardon counts depends on the specific treaty. Some recognize pardons from either party or from a third state; others say nothing about it.
Risk of Torture or an Unfair Trial
A country can refuse extradition when there are substantial grounds to believe the person would face torture, inhumane treatment, or a fundamentally unfair trial. Article 3 of the United Nations Convention Against Torture flatly prohibits transferring anyone to a country where they would be in danger of torture.
In the United States, federal regulations implement that obligation by requiring authorities to consider “all relevant considerations including, where applicable, the existence in the State concerned of a consistent pattern of gross, flagrant or mass violations of human rights.”7eCFR. 22 CFR 95.2 – Application Decision-makers review reports from international monitors, prison conditions, and the likelihood of a fair trial.
Fair trial concerns extend beyond physical safety. International standards look for an independent and impartial court, the presumption of innocence, access to counsel, timely proceedings, and the right to appeal. Routine use of military tribunals for civilians, denial of counsel, or reliance on coerced confessions all give the requested country grounds to refuse.
Where Human Rights Arguments Actually Land in the U.S.
U.S. courts apply what is called the “rule of non-inquiry,” which limits how deeply a judge can examine conditions in the requesting country during the extradition hearing. A Federal Judicial Center guide describes this as reserving “for the Secretary of State the task of assessing whether there are political or humanitarian grounds to deny extradition.”8Federal Judicial Center. International Extradition: A Guide for Judges In practice, most human rights arguments in U.S. cases are directed to the Secretary of State rather than the court. The judge’s role is narrower, focused on whether the treaty requirements are met and the evidence is sufficient.
The Death Penalty Without Assurances
Countries that have abolished capital punishment routinely refuse to extradite anyone who faces a possible death sentence. The landmark case is Soering v. United Kingdom (1989), in which the European Court of Human Rights held that extraditing a person to face Virginia’s death row would violate the prohibition on inhuman or degrading treatment under Article 3 of the European Convention on Human Rights.9European Court of Human Rights. Soering v. The United Kingdom The court pointed to the extreme conditions and psychological anguish of prolonged time on death row.
To get past this ground, the requesting country must provide formal diplomatic assurances that the death penalty will not be sought or, if imposed, will not be carried out. These typically come from the requesting country’s executive branch in an official diplomatic note. Without such a guarantee, the request will almost always fail in an abolitionist country. The United States itself has provided death penalty assurances to other countries when seeking extradition, so the issue cuts both ways.
Nationality of the Person Sought
Many countries, particularly those with civil law traditions, refuse to extradite their own citizens. The restriction is often written into national constitutions. France, Germany, Brazil, and Japan all follow some version of it.
When a country refuses to surrender its citizen, international law generally expects it to prosecute the person at home instead. This “extradite or prosecute” principle keeps citizenship from becoming a shield against accountability. The requested country obtains the case files and evidence from the foreign government and conducts a local trial for the conduct abroad.
Common law countries like the United States generally do not follow this restriction and will extradite their own citizens when a valid treaty is in place.1Office of the Law Revision Counsel. 18 USC 3181 – Scope and Limitation of Chapter The split between civil and common law systems on this point often forces specific compromises during treaty negotiations.
Breaches of the Rule of Specialty
The rule of specialty restricts what the requesting country can do with a person after transfer. Once extradited, the person can only be tried for the specific offenses named in the request. The requesting country cannot add new charges, upgrade the original ones, or prosecute for unrelated conduct that was known about but left out.10United States Department of Justice. 9-15.000 – International Extradition and Related Matters
Two standard exceptions apply. Offenses committed after the person arrives in the requesting country are not covered, because new criminal behavior creates new charges regardless of how the person got there. And if the person stays in the requesting country for a reasonable period after acquittal or completing the sentence, usually specified in the treaty, the restriction lifts.
Specialty also works at the front end. If the requested country believes the requesting country will not honor this limit, perhaps because of past violations, it can refuse extradition or condition surrender on specific guarantees.
Who Decides a Refusal in the United States
Even when every ground above is argued, the decision is split in the United States between two decision-makers. A federal magistrate judge or district court judge holds a hearing on whether the request meets the treaty’s legal requirements. If the judge certifies the request, the case moves to the Secretary of State, who makes the final call on surrender.11Office of the Law Revision Counsel. 18 USC 3186 – Secretary of State to Surrender Fugitive
The court’s certification does not automatically result in transfer. The Secretary of State has broad discretion to refuse on humanitarian, diplomatic, or policy grounds, even after a judge has certified the request as legally sufficient. A federal guide for judges describes the Secretary of State as “the final arbiter of whether or not to extradite an individual.”8Federal Judicial Center. International Extradition: A Guide for Judges That split matters practically: treaty-based arguments like dual criminality, limitations, or specialty belong in court, while torture risk, fair trial concerns, and other humanitarian objections are often more effective when directed to the State Department.