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Extradition is the official process whereby one country transfers a suspected or convicted criminal to another country. Between country, extradition is normally regulated by treaties. Where extradition is compelled by laws, such as among sub-national jurisdictions, the concept may be known more generally as rendition. It is an ancient mechanism, dating back to at least the 13th century BC, when an Egyptian Pharaoh negotiated an extradition treaty with a Hittite King. Through the extradition process, a sovereign (the requesting state) typically makes a formal request to another sovereign (the requested state). If the fugitive is found within the territory of the requested state, then the requested state may arrest the fugitive and subject him or her to its extradition process.  The extradition procedures to which the fugitive will be subjected are dependent on the law and practice of the requested state. 
Extradition treaties or agreements 
The consensus in international law is that a state does not have any obligation to surrender an alleged criminal to a foreign state, because one principle of sovereignty is that every state has legal authority over the people within its borders. Such absence of international obligation, and the desire for the right to demand such criminals from other countries, have caused a web of extradition treaties or agreements to evolve. When there is no extradition agreement in place, or when applicable extradition agreements are inapplicable, a sovereign may still request the expulsion or lawful return of an individual pursuant to the requested state’s domestic law. This can be accomplished through the immigration laws of the requested state or other facets of the requested state’s domestic law. Similarly, the codes of penal procedure in many countries contain provisions allowing for extradition to take place in the absence of an extradition agreement. Sovereigns may, therefore, still request the expulsion or lawful return of a fugitive from the territory of a requested state in the absence of an extradition treaty.
No country in the world has an extradition treaty with all other countries; for example, the United States lacks extradition treaties with several nations, including the People's Republic of China, Namibia, the United Arab Emirates, North Korea, and Bahrain.
Bars to extradition 
By enacting laws or in concluding treaties or agreements, countries determine the conditions under which they may entertain or deny extradition requests. Common bars to extradition include:
- Failure to fulfill dual criminality: generally the act for which extradition is sought must constitute a crime punishable by some minimum penalty in both the requesting and the requested parties.
- Political nature of the alleged crime: most countries refuse to extradite suspects of political crimes.
- Possibility of certain forms of punishment: some countries refuse extradition on grounds that the person, if extradited, may receive capital punishment or face torture. A few go as far as to cover all punishments that they themselves would not administer.
- Death penalty: Many countries, such as Australia, Canada, Macao, New Zealand, South Africa, and most European nations except Belarus, will not allow extradition if the death penalty may be imposed on the suspect unless they are assured that the death sentence will not be passed or carried out.
- Torture, inhuman or degrading treatment or punishment: Many countries will not extradite if there is a risk that a requested person will be subjected to torture, inhuman or degrading treatment or punishment. In the case of Soering v United Kingdom, the European Court of Human Rights held that it would violate Article 3 of the European Convention on Human Rights to extradite a person to the United States from the United Kingdom in a capital case. This was due to the harsh conditions on death row and the uncertain timescale within which the sentence would be executed.
- Jurisdiction: Jurisdiction over a crime can be invoked to refuse extradition. In particular, the fact that the person in question is a nation's own citizen causes that country to have jurisdiction.
- Own nationals: Some countries, such as Brazil,France, Germany, Russia, Austria, the People's Republic of China, the Republic of China (Taiwan) and Japan, forbid extradition of their own nationals. These countries often have laws in place that give them jurisdiction over crimes committed abroad by or against citizens. By virtue of such jurisdiction, they prosecute and try citizens accused of crimes committed abroad as if the crime had occurred within the country's borders (see e.g. trial of Xiao Zhen).
Aut Dedere Aut Judicare 
A concept related to extradition that has significant implications in transnational criminal law is that of aut dedere aut judicare. This maxim represents the principle that states must either surrender a criminal within their jurisdiction to a state that wishes to prosecute the criminal or prosecute the offender in its own courts. Some contemporary scholars hold the opinion that aut dedere aut judicare is not an obligation under customary international law but rather “a specific conventional clause relating to specific crimes” and, accordingly, an obligation that only exists when a state has voluntarily assumed the obligation. Cherif Bassiouni, however, has posited that, at least with regard to international crimes, it is not only a rule of customary international law but a jus cogens principle. Professor Michael Kelly, moreover, citing Israeli and Austrian judicial decisions, has noted that “there is some supporting anecdotal evidence that judges within national systems are beginning to apply the doctrine on their own.” Even so, a wide array of international instruments now contains provisions for aut dedere aut judicare. These include all four 1949 Geneva Conventions,113 the U.N. Convention for the Suppression of Terrorist Bombings, the U.N. Convention Against Corruption, the Convention for the Suppression of the Unlawful Seizure of Aircraft, the Convention Against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment, the Convention for the Protection of Cultural Property in the Event of an Armed Conflict, and the International Convention for the Suppression and Punishment of the Crime of Apartheid.
International tensions 
The refusal of a country to extradite suspects or criminals to another may lead to international relations being strained. Often, the country to which extradition is refused will accuse the other country of refusing extradition for political reasons (regardless of whether or not this is justified). A case in point is that of Ira Einhorn, in which some US commentators pressured President Jacques Chirac of France, who does not intervene in legal cases, to permit extradition when the case was held up due to differences between French and American human rights law. Another long-standing example is Roman Polanski whose extradition California has pursued for over 20 years. For a brief period he was placed under arrest in Switzerland, however subsequent legal appeals there prevented extradition.
The questions involved are often complex when the country from which suspects are to be extradited is a democratic country with a rule of law. Typically, in such countries, the final decision to extradite lies with the national executive (prime minister, president or equivalent). However, such countries typically allow extradition defendants recourse to the law, with multiple appeals. These may significantly slow down procedures. On the one hand, this may lead to unwarranted international difficulties, as the public, politicians and journalists from the requesting country will ask their executive to put pressure on the executive of the country from which extradition is to take place, while that executive may not in fact have the authority to deport the suspect or criminal on their own. On the other hand, certain delays, or the unwillingness of the local prosecution authorities to present a good extradition case before the court on behalf of the requesting state, may possibly result from the unwillingness of the country's executive to extradite.
For example, there is at present a disagreement between the United States and the United Kingdom about the Extradition Act 2003 (text here) that dispenses with the need for a prima facie case for extradition.
This came to a head over the extradition of the Natwest Three from the UK to the U.S., for their alleged fraudulent conduct related to Enron. Several British political leaders were heavily critical of the British government's handling of the issue.
The precedent of the Natwest Three may also be used to extradite/prosecute Philip Watts in connection with the Royal Dutch Shell reserves scandal. The press has carried vocal criticisms of the present extradition arrangements from the UK's business community, some of whom stated that they were avoiding doing business with or in the U.S. because of legal concerns such as the extradition treaty, among other concerns.
A controversy in 2012 concerns the extradition of Richard O'Dwyer from the United Kingdom to the United States.
Extradition and abduction 
Issues of international law relating to extradition have proven controversial in cases where a state has abducted and removed an individual from the territory of another state without previously requesting permission, or following normal extradition procedures. Such abductions are usually in violation of the domestic law of the country in which they occur, as infringements of laws forbidding kidnapping. Many also regard abduction as violation of international law — in particular of a prohibition on arbitrary detention. A small number of countries have been reported to use kidnapping to circumvent the formal extradition process. Notable or controversial cases include the abduction or attempted abduction of
|1950||Morton Sobell||Mexico||United States|
|1967||Isang Yun||West Germany||South Korea|
|1990||Humberto Álvarez Machaín||Mexico||United States|
|2005||Hassan Mustafa Osama Nasr||Italy||Egypt (with confirmed United States involvement)|
|2011||Dirar Abu Seesi||Ukraine||Israel|
"Extraordinary rendition" 
"Extraordinary rendition" is an extrajudicial procedure in which criminal suspects, generally suspected terrorists or supporters of terrorist organisations, extrajudicial transfer of a person from one country to another. The procedure differs from extradition as the purpose of the rendition is to extract information from suspects, while extradition is used to return fugitives so that they can stand trial or fulfill their sentence. The United States' Central Intelligence Agency (CIA) allegedly operates a global extraordinary rendition programme, which from 2001 to 2005 captured an estimated 150 people and transported them around the world.
The alleged US programme prompted several official investigations in Europe into alleged secret detentions and illegal international transfers involving Council of Europe member states. A June 2006 report from the Council of Europe estimated 100 people had been kidnapped by the CIA on EU territory (with the cooperation of Council of Europe members), and rendered to other countries, often after having transited through secret detention centres ("black sites") utillised by the CIA, some of which could be located in Europe. According to the separate European Parliament report of February 2007, the CIA has conducted 1,245 flights, many of them to destinations where suspects could face torture, in violation of article 3 of the United Nations Convention Against Torture. A large majority of the European Union Parliament endorsed the report's conclusion that many member states tolerated illegal actions by the CIA and criticised such actions. Within days of his inauguration, President Obama signed an Executive Order opposing rendition torture and established a task force to provide recommendations about processes to prevent rendition torture.
See also 
- Extraterritorial jurisdiction
- Immunity from prosecution
- Universal jurisdiction
- Right of asylum
- Brian O'Rourke (1540?–1591), first man to be extradited within Britain.
- Luis Posada Carriles, anti-Castrist detained in the U.S. and wanted by Cuba and Venezuela
- Ramil Safarov, Azerbaijani officer extradited from Hungary to Azerbaijan
- Dan E. Stigall, Ungoverned Spaces, Transnational Crime, and the Prohibition on Extraterritorial Enforcement Jurisdiction in International Law: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2211219&download=yes
- Extradition Treaties Interpretation Act of 1998 from the United States Department of State, Extradition Treaties
- Article 7 of Law No. 6/2006 ((Portuguese) Lei n.º 6/2006, Chinese: 第6/2006號法律)
- Includes Albania, Andorra, Armenia, Austria, Azerbaijan, Belgium, Bosnia and Herzegovina, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, Iceland, Ireland, Italy, Israel, Kazakhstan, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malta, Moldova, Monaco, the Netherlands, Norway, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom and Vatican City (Belarus is excluded)
- Brazilian constitution of 1988, Article 5
- "Code of criminal procedure (legislative part), Articles 696-1 to 696-7". published by Légifrance, the official website of the French government for the publication of legislation, regulations, and legal information. 2005-12-13.
- "[[Légifrance]] publications of the French legislation". Légifrance. 2005-12-13. Wikilink embedded in URL title (help)
- Except to a member state of the European Union or to an international court: Basic Law for the Federal Republic of Germany, Article 16 (2), 29 July 2009.
- Article 8 of the Extradition Law of the People's Republic of China (Chinese: 中华人民共和国引渡法)
- Article 4 of the Law of Extradition[dead link] (Chinese: 引渡法) prohibits a citizen of the Republic of China from being extradited from Taiwan, unless the person acquired the citizenship after the request for extradition is made.
- Article 2, Law of Extradition ((Japanese) 逃亡犯罪人引渡法)
- Lib Dem leader joins bankers' extradition battle
- Stevenson, Tom (2006-07-06). "Senior executives attack 'invidious, one-sided treaty'". The Daily Telegraph (London). Retrieved 2010-05-02.
- Gil, Yun-hyeong (2004-10-30). "독일, 당시 국교단절 검토: 67년 윤이상씨등 서울로 납치 '동백림사건' 항의 (Germany considered breaking off relations at the time: Protests over the 1967 "East Berlin incident" kidnapping of Isang Yun and others)" (in Korean). The Hankyoreh. Retrieved 2007-05-30.
- Michael John Garcia, Legislative Attorney American Law Division. Renditions: Constraints Imposed by Laws on Torture 8 September 2009; link from the United States Counter-Terrorism Training and Resources for Law Enforcement web site
- Charlie Savage, "Obama’s War on Terror May Resemble Bush’s in Some Areas". The New York Times. 17 February 2009. Retrieved 2 January 2010.
- "Background Paper on CIA's Combined Use of Interrogation Techniques". 30 December 2004. Retrieved 2 January 2010.
- "New CIA Docs Detail Brutal 'Extraordinary Rendition' Process". Huffington Post. 28 August 2009. Retrieved 2 January 2010.
- Fact sheet: Extraordinary rendition, American Civil Liberties Union. Retrieved 29 March 2007 (English)
- Resolution 1507 (2006). Alleged secret detentions and unlawful inter-state transfers of detainees involving Council of Europe member states]
- "Ensuring Lawful Interrogations | The White House". Whitehouse.gov. Retrieved 17 July 2010.
- Extradition Lawyers' Association
- UN list of extradition information by country (1996)
- A Brief Primer on International Law With cases and commentary. Nathaniel Burney, 2007.
- Extraditions Cut Short - Extraditions between Colombia and United States
- Chiquita Board Members: Total Identification - Extradition of Chiquita Board Members
-  International Extradition: New Jersey & Other States
- Expulsions and extraditions, factsheet of the ECtHR case law