Extradition Treaties
Extradition is the formal legal process by which one country surrenders a person to another country for prosecution or punishment. The US has bilateral extradition treaties with approximately 100 countries — but notably not with Russia, China, the UAE, Qatar, or dozens of other countries where fugitives can find refuge. Two core doctrines shape every extradition request: dual criminality (the conduct must be a crime in both countries) and the political offense exception (purely political crimes are not extraditable). The Assange, Snowden, and Bout cases illustrate the doctrine's power and limits.
Primary Text
18 U.S.C. § 3184; individual bilateral treaties (~100)“Whenever there is a treaty or convention for extradition between the United States and any foreign government, any justice or judge of the United States... may... issue his warrant for the apprehension of the person so charged, that he may be brought before such justice or judge, to the end that the evidence of criminality may be heard and considered... If, on such hearing, he deems the evidence sufficient to sustain the charge under the provisions of the proper treaty or convention, he shall certify the same, together with a copy of all the testimony taken before him, to the Secretary of State, that a warrant may issue upon the requisition of the proper authorities of such foreign government, for the surrender of such person. (18 U.S.C. § 3184)”
What It Means
The US extradition framework is built on bilateral treaties — there is no general US extradition statute that applies absent a treaty, and courts have confirmed that the US has no obligation to extradite without one. The US currently has extradition treaties with approximately 100 countries, meaning that about 95 countries — including Russia, China, Saudi Arabia, the UAE, Qatar, Egypt, and much of Southeast Asia and Central Asia — have no treaty obligation to surrender persons the US wants. Fugitives who reach non-treaty countries are largely beyond US legal reach, absent voluntary cooperation or extraordinary rendition (with its own legal risks). The geographic scope of the US treaty network reflects Cold War-era alliances — it is dense in Western Europe and Latin America, sparse in the former Soviet space and much of Asia.
The dual criminality requirement is the first hurdle in any extradition proceeding: the conduct for which extradition is sought must be a crime in both countries. This requirement exists in virtually all US extradition treaties, though some modern treaties use a 'list approach' (specifying covered offenses) while others use the broader 'dual criminality approach.' Dual criminality prevents the US from extraditing individuals for conduct that is legal in the US — such as speech that is criminalized abroad as sedition or blasphemy — and prevents foreign states from requiring the US to extradite for purely political prosecutions of dissidents. The requirement creates complexity when the conduct at issue falls in a legal gray zone in one or both countries: cybercrime, financial crimes involving differing regulatory standards, and drug offenses where one country has decriminalized conduct that remains criminal in the other.
The political offense exception is one of the most litigated doctrines in extradition law. Traditional extradition treaties contain provisions stating that extradition shall not be granted for purely political offenses. The doctrine originated to protect revolutionary fighters and political dissidents from persecution under the guise of criminal prosecution. Courts have developed tests distinguishing purely political offenses (which are protected) from ordinary crimes with political motivation (which are not). The exception has been narrowed over time — the 1985 Supplementary Treaty between the US and UK specifically excluded acts of terrorism, conspiracy to commit murder, and hostage-taking from the political offense exception, even if politically motivated.
Real-World Application
The extradition of Julian Assange consumed nearly a decade of litigation across two continents. Assange, an Australian national, lived in Ecuador's London embassy for seven years after the UK Supreme Court authorized his extradition to Sweden on sexual assault charges. When Ecuador withdrew his asylum in 2019, the UK arrested him on a US extradition request. The US charged him with 17 counts under the Espionage Act and one count of computer fraud for publishing classified military and diplomatic documents. UK courts repeatedly found him extraditable on the espionage charges but blocked extradition on mental health and First Amendment grounds, requiring US assurances about prison conditions. In June 2024, Assange pleaded guilty to a single conspiracy count in a deal that allowed him to return to Australia — ending the case before the political offense and First Amendment questions could be definitively resolved.
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