Why Civil Law Nations Refuse to Extradite Their Citizens and Run Domestic Trials Instead

Civil law nations do not extradite their own citizens because their constitutions view the right to face a domestic judge as an inalienable protection. When a citizen commits a crime abroad and returns home, these governments do not shield them. Instead, they use the active nationality principle to prosecute the offender locally using foreign evidence.[1][4]

The United States and the United Kingdom operate on territorial jurisdiction, meaning they prioritize trying the crime where the evidence and victims are located. If an American citizen commits a murder in Paris and flees to New York, the US Department of Justice will arrest them and extradite them to face French courts.

In contrast, countries operating under the civil law tradition derived from Roman law—including France, Germany, Brazil, and Japan—operate on nationality jurisdiction. A French citizen remains subject to French law anywhere in the world, and the French state claims the exclusive right to judge them.[1]

If that French citizen violates a US law that is also a crime in France, French prosecutors have the authority to try them in Paris. The US must send the evidence across the Atlantic, and a French judge will determine guilt and hand down a sentence under the French penal code.[2]

This substitution relies on the international law principle of aut dedere aut judicare, which translates to "extradite or prosecute." When a civil law state denies an extradition request based on nationality, it assumes the binding treaty obligation to submit the case to its own competent authorities for prosecution.[1]

The Constitutional Shield

The prohibition on extraditing nationals is rarely just a policy preference; it is usually hardcoded into the nation's founding documents. Article 16, Paragraph 2 of the German Basic Law states plainly that "no German may be extradited to a foreign country."[3]

This absolute ban was written into the 1949 constitution to prevent the banishment of citizens, a historical abuse prevalent in continental Europe during the 19th and early 20th centuries. The state is viewed as having a paternal duty to protect its citizens from foreign penal systems.[3][4]

Brazil’s 1988 Constitution goes even further in Article 5, declaring that no native-born Brazilian shall ever be extradited under any circumstances. The Brazilian Supreme Federal Court has consistently blocked US requests to extradite Brazilian nationals, regardless of the crime's severity or the weight of the evidence.

France codifies the ban in Article 696-4 of its Code of Criminal Procedure, which explicitly lists French nationality as an absolute bar to extradition. The French government determines nationality based on the date the offense was committed, preventing suspects from naturalizing after the fact to avoid transfer.[2]

The only major structural carve-out to this rule exists within the European Union. In 2004, the EU introduced the European Arrest Warrant, a mechanism designed to force member states to surrender their nationals to other EU countries to streamline cross-border justice.[1]

To comply with the European Arrest Warrant, Germany had to amend its constitution. The Basic Law now allows the extradition of Germans to other EU member states or international tribunals, provided that the rule of law is maintained and the suspect can return to Germany to serve their sentence.[3]

The Active Nationality Principle

The active nationality principle asserts that a sovereign state has the right to regulate the conduct of its citizens beyond its territorial borders. When a state refuses extradition, this principle provides the legal foundation for the substitute domestic trial.[1][4]

For a domestic trial to proceed under this principle, the act must satisfy the dual criminality requirement. The UNODC Manual on Mutual Legal Assistance notes that this rule ensures states "do not use their coercive powers to assist in the enforcement of foreign criminal laws that are inconsistent with their own domestic values."

If a German citizen commits an act in Thailand that violates Thai law but is perfectly legal under the German penal code, German prosecutors cannot charge them. The dual criminality rule ensures that citizens are only punished for acts their home country deems morally and legally reprehensible.[3]

When dual criminality is met, the requesting state must translate and transfer its entire police file, witness statements, and forensic evidence to the home country. A US prosecutor seeking justice for a financial fraud in Florida must hand their entire case over to a French magistrate.

This transfer of proceedings shifts the financial and administrative burden of the trial onto the home country. The civil law nation must fund the prosecution, provide the defense, and pay for the incarceration of a citizen who committed a crime thousands of miles away.[4]

The Friction of Foreign Evidence

Moving a criminal trial across international borders creates massive logistical and procedural friction. Witness testimony recorded in English under common law cross-examination rules must be admitted into a civil law inquisitorial system, often requiring extensive translation and re-authentication.

Common law systems rely heavily on live witness testimony and the right of the defense to cross-examine accusers in open court. Civil law systems rely more heavily on the written dossier compiled by an investigating magistrate, creating a clash of evidentiary standards.

If a US witness refuses to travel to Paris to testify in a substituted trial, the French court cannot subpoena them. The prosecution must rely on written statements or video links, which can weaken the case and lead to acquittals that would not have occurred in the original jurisdiction.[4]

Despite these evidentiary hurdles, the United Nations Office on Drugs and Crime tracks a 78 percent initiation rate for domestic trials when extradition is denied on nationality grounds. The home country actively pursues the charges rather than letting the suspect walk free.

However, the suspect is ultimately sentenced under their home country's penal code, not the foreign one. A European citizen facing a potential life sentence without parole in the United States will instead face a capped European sentence, which often maxes out at 15 to 25 years.[4]

The Common Law Frustration

Common law prosecutors frequently view the nationality exception as an obstruction of justice. The US Department of Justice consistently argues that the best place to try a crime is where the witnesses, victims, and physical evidence reside, not where the defendant holds a passport.

When the United States negotiates extradition treaties with civil law nations, it routinely includes a mandatory submission clause. This clause requires the requested state to submit the case to its competent authorities for domestic prosecution if nationality blocks the physical transfer.[1]

The 1996 extradition treaty between the United States and France explicitly outlines this process. Article 3 states that neither party is obligated to extradite its own nationals, but if extradition is refused, the requested state must submit the case for prosecution at the request of the other party.[2]

High-profile cases routinely highlight the divide between the two systems. When film director Roman Polanski fled the US to France in 1978, his French citizenship permanently shielded him from extradition, frustrating US prosecutors for decades.[4]

While France could theoretically have tried Polanski for the underlying offenses under the active nationality principle, the French statute of limitations for the crimes had already expired by the time the US formally requested his transfer, leaving him legally untouchable in Paris.[2][4]

The Global Divide in Transnational Crime

Across the globe, approximately 70 nations maintain an absolute or near-absolute ban on extraditing their own citizens. Almost all of these are rooted in the civil law tradition, creating a permanent structural asymmetry in international law enforcement.[1]

The United States extradites hundreds of American citizens to foreign countries every year, trusting foreign courts to provide a fair trial. In return, the US receives foreign nationals from common law partners, but must settle for substitute trials when dealing with civil law allies.

As transnational crime and cybercrime increase, the rigid nationality exception faces mounting pressure. Cybercriminals can target US financial infrastructure from their home countries, knowing their citizenship protects them from ever facing an American jury.[4]

In 2021, Russian national Denis Dubnikov was arrested in the Netherlands for laundering ransomware payments. Because the Netherlands allows the extradition of its citizens and residents under specific conditions, he was transferred to the US. Had he remained in Russia, the Russian constitution would have barred his extradition entirely.[4]

To bridge the gap, international tribunals like the International Criminal Court operate outside the standard state-to-state extradition framework. The Rome Statute requires member states to surrender individuals to the Hague, bypassing domestic constitutional bans on extraditing nationals to foreign sovereigns.[1]

The civil law refusal to extradite is not a refusal to punish; it is a fundamental disagreement over who holds the authority to judge a citizen. By substituting domestic trials, these nations ensure their citizens face justice, but only on their own soil.[1][4]

The active nationality principle ensures that the world does not become a patchwork of safe havens for fleeing criminals. A border may stop a police officer from making an arrest, but the legal obligation to prosecute ensures the evidence crosses the border even when the suspect cannot.[4]