Dual criminality means that the conduct underlying an extradition request must generally be criminal in both the requesting country and the country asked to surrender the person. The offenses do not normally need identical names or statutory elements. The decisive question is whether the alleged conduct would amount to a criminal offense under the law of each country, subject to the wording of the applicable treaty and domestic legislation.
What Is Dual Criminality?
Dual criminality, also called double criminality, is a threshold requirement found in many extradition treaties and national extradition laws.
It requires the alleged conduct to be punishable:
- in the country seeking extradition, known as the requesting state; and
- in the country where the requested person is located, known as the requested state.
The principle protects a person from being surrendered for conduct that the requested state does not treat as criminal. At the same time, it does not require both countries to organize their criminal laws in exactly the same way.
The U.S. Department of State describes dual criminality as a threshold requirement under which the conduct for which extradition is sought must constitute a crime under the laws of both countries.
Why Does Double Criminality Matter in Extradition?
Criminal laws differ between countries. Conduct treated as a serious offense in one legal system may be lawful, regulated only administratively, or defined more narrowly in another.
The double criminality requirement helps ensure that the requested state does not use its coercive powers to surrender a person for conduct that falls outside its own criminal law.
In practice, the principle serves several functions:
- it respects the criminal-law policy of the requested state;
- it limits extradition to conduct recognized as criminal by both jurisdictions;
- it allows courts to identify requests based on materially different conduct;
- it prevents extradition merely because a foreign authority has attached a criminal label to an allegation;
- it provides a defined issue for judicial review before surrender.
Dual criminality is not, however, a decision about guilt. An extradition court does not conduct the full criminal trial that would take place in the requesting country.
Is Dual Criminality Required in Every Extradition Case?
Not necessarily.
Extradition is governed by the applicable legal framework, which may include:
- a bilateral extradition treaty;
- a multilateral convention;
- the domestic law of the requested country;
- a regional surrender system;
- a reciprocity arrangement where extradition without a treaty is permitted.
The precise test must therefore be taken from the relevant treaty and national legislation. It is unsafe to assume that a general rule applies identically in every country.
In the United States, international extradition is generally a treaty-based process conducted between the federal government and a foreign state. U.S. law also contains limited statutory exceptions in which surrender may be available without a treaty.
For a person facing extradition to the United States, the first step is to identify the controlling treaty and examine its definition of an extraditable offense.
How Courts Apply the Dual Criminality Test
A dual criminality analysis normally focuses on the conduct alleged in the extradition materials rather than merely comparing the titles of the offenses.
The court may ask:
- What conduct is actually alleged?
- Was that conduct criminal in the requesting country?
- Would substantially the same conduct be criminal in the requested country?
- Does the offense meet any minimum-penalty threshold in the treaty?
- Are there special treaty provisions concerning attempt, conspiracy, participation, taxation, cybercrime, or extraterritorial conduct?
This is a legal comparison, not a word-matching exercise.
The names of the offenses do not have to match
An offense may be called fraud in one country and obtaining property by deception in another. One jurisdiction may prosecute conduct as breach of trust, while another may classify substantially the same behavior as embezzlement.
Different labels do not necessarily prevent extradition.
U.S. extradition jurisprudence has long recognized that dual criminality does not require the crimes to have the same name, identical scope, or matching elements. It is generally sufficient if the particular conduct is criminal in both jurisdictions.
The statutory elements do not always have to be identical
Countries frequently define intent, participation, loss, jurisdiction, and procedural requirements differently.
A court may therefore find dual criminality even where:
- the offenses contain different technical elements;
- one country uses a broader statutory definition;
- the penalty ranges differ;
- one offense is divided into several separate offenses in the other country;
- the requested state would prosecute the conduct under a different statute.
The relevant treaty may still impose limits, so the court must apply its precise wording rather than rely on a general formula.
The underlying conduct must be identified accurately
A dual criminality analysis should not rely only on a short description of the charge. The extradition request may include:
- an arrest warrant;
- an indictment or charging document;
- a statement of facts;
- witness evidence;
- documentary evidence;
- a summary of the relevant foreign law.
U.S. courts may consider the conduct described in the supporting extradition materials rather than confining the analysis to the formal elements appearing on the face of the foreign charge.
Does the Offense Need the Same Punishment in Both Countries?
Usually not, but the offense may need to satisfy a minimum seriousness threshold.
Many modern treaties define extraditable offenses by reference to the maximum available punishment in both countries. A common threshold is imprisonment for at least one year, although the applicable period varies by treaty.
For example, Article 2 of the European Convention on Extradition generally covers offenses punishable under the laws of both the requesting and requested states by a maximum period of imprisonment of at least one year. Where extradition is sought to enforce an existing sentence, the Convention uses a separate sentence threshold.
The penalties do not usually have to be identical. One country may provide a maximum sentence of five years and the other three years, while dual criminality can still be satisfied if both exceed the applicable treaty threshold.
Practical Examples of Dual Criminality
Fraud with different statutory definitions
A person is accused of intentionally making false representations to obtain funds.
The requesting country charges the conduct as fraud. The requested country has no offense with the same title but criminalizes obtaining property by deception.
Dual criminality is likely to be satisfied because the core conduct—intentional deception resulting in unlawful financial gain—is punishable in both countries.
Conduct that is only a civil or regulatory violation
A foreign authority characterizes a contractual dispute as a criminal offense. In the requested state, the alleged facts establish only a failure to perform contractual obligations, without deception, misappropriation, or another criminal element.
Dual criminality may not be satisfied if the conduct would create only civil liability in the requested state.
The analysis depends on the facts, not on whether the requesting authority has used terms such as fraud or theft.
Speech or publication offenses
A person is prosecuted for publishing statements critical of public officials. The conduct is criminalized in the requesting country but would be protected expression and not a criminal offense in the requested country.
The absence of dual criminality may prevent extradition. Separate protections concerning political offenses and human rights may also apply, but these are distinct legal issues.
Cybercrime committed across several countries
A person allegedly accesses computer systems without authorization and transfers confidential data.
The requesting state may charge computer interference, data theft, or cyber fraud. The requested state may use different statutory terms but criminalize the same unauthorized access and acquisition of data.
The fact that the statutes are structured differently does not necessarily defeat dual criminality.
Tax and customs offenses
Tax offenses have historically received special treatment in some extradition systems. Modern treaties increasingly permit extradition for fiscal offenses even where the countries use different tax structures.
Whether dual criminality is satisfied depends on the treaty language and whether the underlying conduct—such as deliberate concealment, false declarations, or fraudulent evasion—would be criminal in the requested state.
Dual Criminality and the European Arrest Warrant
The European Arrest Warrant is a regional judicial surrender mechanism between EU Member States. It is not the same as traditional extradition under a bilateral treaty.
Under the EU Framework Decision, verification of dual criminality is removed for 32 listed categories of offenses when the offense is punishable in the issuing state by a maximum custodial sentence of at least three years.
These categories include, among others:
- terrorism;
- trafficking in human beings;
- corruption;
- participation in a criminal organization;
- money laundering;
- cybercrime;
- murder and serious bodily injury;
- fraud affecting the financial interests of the European Union.
For offenses outside the listed categories, the executing state may generally verify whether the conduct also constitutes an offense under its own law.
This limited removal of the double criminality check does not mean that every warrant must be executed automatically. Other statutory grounds for refusal and fundamental-rights safeguards may still require examination.
More information on this separate surrender system is available in our guide to the European Arrest Warrant.
Dual Criminality in U.S. Extradition Proceedings
In U.S. extradition cases, the applicable treaty is the starting point.
The court generally considers whether:
- the court has jurisdiction;
- a valid extradition treaty is in force;
- the charged conduct falls within the treaty;
- the person before the court is the person sought;
- the evidence meets the applicable extradition standard;
- dual criminality and any treaty penalty threshold are satisfied.
The judicial role is limited. A U.S. extradition hearing is not a trial on guilt or innocence, and the ultimate surrender decision may involve both judicial certification and an executive decision by the Secretary of State.
Conduct-based comparison
The dual criminality inquiry ordinarily compares the conduct underlying the foreign charges with U.S. criminal law.
It is not always necessary to identify one U.S. offense that reproduces every foreign element. Courts instead examine whether the alleged acts would be criminal under federal law, state law, or another body of law recognized by the applicable treaty analysis.
Treaty-specific penalty requirements
Many U.S. treaties require the conduct to be punishable in both countries by imprisonment exceeding a stated minimum, commonly one year.
The exact threshold must be checked in the treaty. It should not be inferred from another U.S. extradition relationship.
Federal and state criminal laws
Because the United States has federal and state criminal systems, conduct may have an equivalent under federal law, the law of a state, or both.
Which law may be considered depends on the treaty language and the approach taken by the court hearing the request.
A case-specific review by an extradition treaty lawyer should therefore begin with the treaty text, the extradition complaint, and the complete statement of alleged conduct.
Does the Requested Country Have to Criminalize Extraterritorial Conduct?
This can be a significant issue.
Suppose the alleged acts occurred entirely outside the requested country. The requested state may criminalize the type of conduct but would not normally have jurisdiction to prosecute it when committed abroad.
Courts and treaties address this issue differently. Some frameworks use a hypothetical approach, asking whether the conduct would be criminal if it had occurred within the requested state. Others contain specific provisions concerning extraterritorial jurisdiction.
The result may depend on:
- the wording of the treaty;
- where the relevant acts occurred;
- where the harm occurred;
- the nationality of the accused or victims;
- whether domestic law recognizes extraterritorial jurisdiction;
- whether the offense is subject to universal or treaty-based jurisdiction.
A general comparison of offense names is insufficient in cases involving cross-border conduct.
Attempt, Conspiracy, and Participation
An extradition request may concern conduct that was planned but not completed, or participation in an offense committed by others.
Treaties often extend extradition to:
- attempt;
- conspiracy;
- aiding and abetting;
- counseling or procuring an offense;
- participation in a criminal group.
Dual criminality must then be assessed in relation to the alleged form of liability.
For example, it may not be enough to show that the completed offense exists in both countries if the requested state does not criminalize the alleged preparatory conduct or form of participation in comparable circumstances.
The treaty may contain an express clause resolving this issue.
When Can Lack of Dual Criminality Prevent Extradition?
A dual criminality objection may be relevant where:
- the conduct is not criminal in the requested state;
- the foreign charge concerns only a civil, administrative, or regulatory breach;
- the requested state requires an element absent from the alleged facts;
- the equivalent domestic offense did not exist at the relevant time;
- the conduct does not meet the treaty’s minimum-penalty threshold;
- the requesting state relies on an impermissibly broad interpretation of the alleged acts;
- the request combines extraditable and non-extraditable charges;
- the alleged territorial or extraterritorial basis does not satisfy the applicable legal test.
Failure of dual criminality may defeat extradition for one charge without resolving the entire case. If the request contains several charges, the court may find some extraditable and others not.
Dual Criminality Is Not the Same as Other Extradition Defenses
Several extradition defenses are frequently confused with double criminality.
Political offense exception
The political offense exception concerns the character of the alleged offense or prosecution. It does not ask only whether the conduct is criminal in both countries.
A charge can satisfy dual criminality yet still raise a separate political offense exception.
Human rights objections
A court or executive authority may need to consider risks such as torture, inhuman treatment, a flagrantly unfair trial, or the death penalty.
These issues are separate from whether the alleged conduct is criminal in both states. A request can satisfy dual criminality but still face a serious human rights objection to extradition.
Double jeopardy or ne bis in idem
Double jeopardy addresses whether the person has already been finally tried, convicted, or acquitted for the relevant offense.
Dual criminality compares the criminal laws of two countries. The two principles should not be treated as interchangeable.
Rule of specialty
The rule of specialty limits the offenses for which an extradited person may be prosecuted after surrender.
It generally becomes relevant after extradition has been granted and does not determine whether the original conduct is criminal in both countries.
Evidentiary sufficiency
The requesting state may also have to provide evidence satisfying the standard required by the treaty and domestic law.
Even where dual criminality exists, extradition can fail if the supporting evidence does not meet the applicable legal threshold.
Does Dual Criminality Apply to an INTERPOL Red Notice?
INTERPOL does not decide whether dual criminality has been established for the purpose of granting extradition.
A Red Notice is a request to locate and provisionally arrest a person pending extradition, surrender, or similar legal action. It is based on a national arrest warrant or judicial order, but it is not itself an international arrest warrant.
Each country decides what legal effect to give a Red Notice under its own law.
The dual criminality issue is normally determined later by the competent national authorities or courts during the extradition process.
Therefore:
- publication of a Red Notice does not establish that extradition will be granted;
- arrest based on a Red Notice does not resolve dual criminality;
- removal of a Red Notice does not automatically cancel a national criminal case;
- refusal of extradition does not necessarily erase data already held by national authorities.
How a Dual Criminality Analysis Is Prepared
A proper legal analysis should be based on the actual extradition documents rather than a general description of the case.
Step 1: Identify the controlling legal instrument
Determine whether the case is governed by:
- a bilateral treaty;
- a multilateral convention;
- domestic extradition legislation;
- a European Arrest Warrant;
- another regional surrender arrangement.
Step 2: Separate each charge
Every offense should be analyzed independently. A request involving fraud, conspiracy, money laundering, and document offenses may produce different conclusions for each count.
Step 3: Extract the alleged conduct
The analysis should identify:
- what the person allegedly did;
- when and where the acts occurred;
- the alleged mental state;
- the resulting harm or intended benefit;
- the person’s alleged role;
- whether the offense was completed or attempted.
Step 4: Identify comparable domestic offenses
The requested state’s criminal law should then be examined for offenses covering substantially the same conduct.
The objective is not to find identical wording. It is to determine whether the alleged behavior would be criminal under the requested state’s law.
Step 5: Check punishment thresholds
The potential punishment in each country must be compared with the minimum required by the treaty or statute.
Step 6: Examine exceptions and related defenses
The review should separately consider:
- political offense provisions;
- limitation periods;
- prior judgments;
- nationality restrictions;
- territorial jurisdiction;
- human rights;
- death-penalty assurances;
- evidentiary requirements;
- the rule of specialty.
What to Do if Dual Criminality Is Disputed
A person facing extradition should obtain the complete request and supporting documents as early as the applicable procedure permits.
The defense may need to:
- identify the precise conduct relied on by the requesting state;
- challenge an incomplete or misleading description of the facts;
- compare the relevant statutes in both jurisdictions;
- obtain translations and expert evidence on foreign law;
- distinguish civil or regulatory conduct from criminal conduct;
- analyze each charge separately;
- identify treaty thresholds and exceptions;
- preserve separate human-rights and procedural objections.
A dual criminality argument should be tied to the language of the applicable treaty and the facts alleged in the formal extradition materials. Broad claims that the two countries have different laws are usually insufficient.
Legal Assistance in Dual Criminality Cases
Dual criminality disputes often require coordinated analysis by lawyers in both the requesting and requested countries.
Legal work may include:
- reviewing the extradition treaty;
- comparing the alleged conduct with criminal statutes in both jurisdictions;
- preparing submissions on foreign law;
- challenging non-extraditable charges;
- addressing provisional arrest and bail;
- coordinating the extradition defense with the underlying criminal case;
- examining related INTERPOL data;
- preparing arguments based on human rights or political motivation.
No dual criminality argument guarantees that extradition will be refused. The result depends on the treaty wording, the facts alleged, the available evidence, and the law applied by the competent court.
Where a request has already been issued or is expected, a dual criminality extradition lawyer can assess whether the alleged conduct meets the legal test in both jurisdictions.
Frequently Asked Questions
What is dual criminality?
Dual criminality is the requirement that the conduct underlying an extradition request be criminal in both the requesting and requested countries.
Are dual criminality and double criminality the same?
Yes. The two terms generally describe the same extradition principle. “Dual criminality” is more common in U.S. legal materials, while “double criminality” is widely used in international and European practice.
Do the offenses need the same legal name?
No. The offense names and statutory wording can differ. Courts usually focus on whether the alleged conduct is criminal in both jurisdictions.
Do the elements of the offenses have to be identical?
Usually not. Comparable criminality may be sufficient even if the offenses contain different technical elements. The applicable treaty and domestic case law determine the precise test.
Can extradition be refused if the conduct is legal in the requested country?
Potentially, yes. If dual criminality is required and the conduct would not constitute a criminal offense in the requested country, extradition may be refused for that charge.
Does dual criminality determine whether the person is guilty?
No. It is a threshold issue in the extradition process. Guilt or innocence is decided in the criminal proceedings before the competent court in the requesting country.
Is dual criminality always required under a European Arrest Warrant?
No. The executing state does not verify dual criminality for 32 listed offense categories when the required punishment threshold is met. For other offenses, a dual criminality check may still apply.
Can a Red Notice prove dual criminality?
No. A Red Notice is an international police cooperation request, not a judicial finding that the extradition requirements have been satisfied.
Can some charges satisfy dual criminality while others do not?
Yes. Courts may analyze each charge separately and certify extradition for some offenses while refusing it for others.
Is political motivation part of the dual criminality test?
Not directly. Political motivation, the political offense exception, and human-rights concerns are separate issues, although they may be raised alongside a dual criminality objection.
