Extradition is the formal legal process of one country surrendering an individual to another country for prosecution or punishment. This happens when a person commits a crime in the requesting country’s jurisdiction and then flees across a border. Local police cannot simply cross an international boundary to chase a suspect. They need their national government to ask the foreign government to arrest and hand over the fugitive.
This system relies almost entirely on formal agreements. It is rare for states to hand over fugitives without a treaty, according to the Council on Foreign Relations. These treaties establish the exact rules and conditions for transferring a person between two sovereign nations. Without a clear legal framework in place, governments generally refuse to cooperate.
No single country has an extradition treaty with every other nation on Earth. The United States lacks treaties with dozens of countries. This geographic reality creates safe havens. If a person reaches a country that has no treaty with the pursuing nation, the fugitive is usually protected from arrest.
Background: How We Got Here
The modern system grew out of practical necessity. In the past, kings and emperors handed over fugitives as political favors. There were no consistent legal standards protecting the accused. But as international travel became faster in the 19th century, criminals found it easy to outrun local police. Governments realized they needed a structured, reliable system.
They began signing bilateral treaties. A bilateral treaty is a binding agreement between exactly two nations. Multilateral treaties also exist, involving groups of nations agreeing to a shared framework, but the bilateral treaty remains the standard tool for law enforcement.
Early treaties used a strict list system. Diplomats wrote down every specific crime that qualified for extradition. If a treaty listed murder, arson, and robbery, police could only request a fugitive for those specific acts. Embezzlement did not qualify if it was absent from the list.
This approach created legal loopholes as technology advanced. Cybercrime, digital fraud, and modern money laundering did not exist on the old lists. Criminals exploited these gaps. To fix this, nations shifted to a “dual criminality” approach. Modern treaties discard the specific lists. They state that any act punishable by more than one year in prison in both countries qualifies for extradition. This keeps the legal framework relevant as specific criminal laws change over time.
Key Players and Stakeholders
An extradition case involves several distinct parties. The requesting state wants the person back. The requested state currently holds the person. The fugitive sits in the middle of the legal fight.
Local police and prosecutors initiate the action. They build a criminal case and ask their national government to make the request. The national government then contacts the requested country through formal diplomatic channels.
The actual process of requesting a fugitive involves large amounts of paperwork. It is never a simple phone call between police departments. The requesting country must assemble a comprehensive extradition package. This package contains the arrest warrant, the specific criminal statutes violated, sworn affidavits from investigators, and a detailed summary of the evidence. The paperwork is translated into the official language of the requested country. Diplomats then physically hand the package to their counterparts.
Interpol frequently acts as the communication bridge in the early stages. Interpol does not employ police officers who arrest people. It functions as a secure messaging system for law enforcement. If a suspect is a severe flight risk, authorities can issue a provisional arrest request through Interpol. This allows the requested country to detain the fugitive immediately, giving the requesting country time to prepare the formal legal paperwork.
Once the suspect is in custody, domestic courts take over. Judges in the requested country review the evidence. They do not decide if the person is guilty of the crime. They only decide if the formal request meets all the legal requirements laid out in the treaty. If a judge approves the request, the final decision usually goes to the executive branch. A government minister makes the final call and retains the authority to refuse the transfer even if the courts approved it.
What’s at Stake: Rules and Human Rights
Extradition requires a balance. Nations want to prosecute criminals, but they also have to protect the fundamental rights of people inside their borders. International law developed strict rules to manage this friction:
- Dual Criminality: The accused act must be illegal in both countries. If someone is charged with insulting a political leader in a foreign country, but the requested country protects free speech, the requested country will deny the extradition.
- The Rule of Specialty: An extradited person can only face prosecution for the exact crimes listed in the approved extradition request. A government cannot request a person for tax fraud and then charge them with unrelated political crimes upon their return.
- Double Jeopardy: A person cannot be extradited to face prosecution for a crime if they have already been tried, convicted, or acquitted for that exact same offense. This ensures individuals do not face endless trials for a single act.
Suspects retain specific legal rights during this process, including the presumption of innocence and access to a lawyer. A requested country will routinely deny a request if they believe the fugitive will face an unfair trial, torture, or cruel treatment. Many countries will also refuse an extradition if the suspect faces the death penalty, unless the requesting state provides a binding guarantee that they will not execute the person.
The political offense exception provides another layer of protection. Almost all modern treaties allow a country to refuse an extradition if the crime is political in nature. This includes acts like treason, espionage, or peaceful political dissent. This prevents authoritarian governments from using the international legal system to hunt down political opponents.
Many sovereign nations also refuse to extradite their own citizens. Countries like France and Germany have legal bans on handing over their nationals. If a French citizen commits a crime abroad and returns to France, the French government will not extradite them. Instead, they will prosecute the citizen in a French court. The United States and the United Kingdom, by contrast, readily extradite their own citizens if a valid treaty exists.
Extradition is also a highly expensive undertaking. The requesting country usually covers all the financial costs. They pay for the official legal translations, the legal fees for the government lawyers in the requested country, and the transportation to bring the fugitive back. Police often have to charter private flights to transport high-risk fugitives securely. Because of the high financial and diplomatic costs, countries reserve extradition requests for severe crimes like murder, large-scale drug trafficking, and major financial fraud. They do not spend hundreds of thousands of dollars to extradite people for minor offenses.
The Reality of the Process: The Daniel Duggan Case
The legal battles surrounding extradition often take years to resolve. They blend local criminal law with high-level international diplomacy.
The case of Daniel Duggan provides a clear example of how this plays out. Duggan is a former US fighter pilot who moved to Australia. In 2022, Australian police arrested Duggan at a supermarket. The United States government made the formal request.
The US accused Duggan of breaching arms trafficking laws by training Chinese military personnel in South Africa between 2010 and 2012. Duggan strongly denied the allegations. He spent three and a half years in Australian custody, with much of that time in solitary confinement. He fought the extradition request at every level of the Australian legal system.
After years of fighting the charges, his appeal against the decision greenlighting the extradition was struck down in April 2026. This case shows how long a person can remain in a foreign prison before they even face a trial for the actual charges. Judges frequently deny bail to individuals fighting extradition because the suspects are, by definition, flight risks. If they fled one jurisdiction, courts assume they will flee again.
Frequently Asked Questions
What is the rule of dual criminality?
The rule of dual criminality dictates that an individual can only be subject to extradition if the specific act they committed is classified as a criminal offense in both the country requesting the extradition and the country where the fugitive is currently residing. If the act is legal in the requested country, the extradition fails.
Can a country extradite someone without a treaty?
While it is legally possible for some states to surrender an individual without a formal treaty, it is exceptionally rare. The vast majority of global extraditions rely on the legal frameworks established by bilateral or multilateral treaties between nations.
How does Interpol help in the extradition process?
Interpol does not arrest people directly. It facilitates secure communication between international police forces. If a case is urgent and a fugitive is a flight risk, a country can use Interpol channels to request a provisional arrest, allowing local authorities to detain the individual while the formal extradition request is prepared.
Are there crimes that prevent extradition?
Yes. Under the political offense exception, nations can refuse to extradite individuals accused of political crimes like treason or espionage. A country will also generally deny an extradition request if the accused faces the death penalty, a high risk of torture, or an unfair trial in the requesting state.