Extradition Treaties: Why Some Countries Cooperate and Some Don't

If you've read our overview on “What is Extradition?”, you already know that extradition usually requires a legal basis. In most cases, that basis is a treaty. Here's how these agreements actually work.

Why Treaties Matter

A country generally cannot be forced to hand someone over just because another country asks. Extradition treaties create a mutual, binding obligation: each side agrees, in advance, on the conditions under which it will surrender people to the other. Without a treaty, extradition is still occasionally possible, but it becomes rare, slow, and dependent on goodwill rather than legal obligation.

What's Typically Inside an Extradition Treaty

Covered offenses: Older treaties often list specific crimes covered. Modern treaties usually take a broader approach: any offense punishable above a certain threshold (often more than one year in prison) in both countries.

Dual criminality: This is one of the most important concepts in extradition law. It means the act the person is accused of must be a crime in both the requesting and the requested country. If it's illegal in one country but not the other, extradition is typically refused.

Exceptions: Treaties almost always list circumstances where extradition must or may be denied, political offenses, risk of the death penalty, and issues of nationality are common examples.

Procedural rules: Treaties also set out timelines, evidence standards, and how appeals work.

What Happens Without a Treaty?

Some countries will still extradite on a case-by-case basis even without a formal treaty, based on domestic law or reciprocity, but this is the exception rather than the rule. Countries without extradition arrangements with each other are sometimes used, deliberately, as a place to seek refuge from prosecution.

Regional Systems Can Work Differently

Some regions have streamlined extradition beyond the traditional treaty model. Within the European Union, for example, the European Arrest Warrant allows member states to request and carry out transfers relatively efficiently, without needing separate political approval for each case.

Treaties and the United States

The U.S. extradition system is entirely treaty-based, U.S. law generally requires a treaty to be in place before extradition can be considered. For the specifics, see our blog on “Which Countries Have Extradition Treaties with the U.S.?”

Why This Matters for Your Case

Whether a treaty exists, and exactly what it says, often determines whether an extradition case can proceed at all. This is usually the first thing worth checking in any extradition matter.

For tailored advice and effective legal strategies in extradition or any other legal matters, feel free to reach out to us at Merit Law LLP. Our team of experienced legal professionals is here to assist you every step of the way. Contact us at +1 (973) 317-6056, via email at info@meritllp.com, or through the contact form on our website.