Extradition law in the United States
Extradition law in the United States is the formal process by which a fugitive found in one country or state is surrendered to another country or state for trial or punishment. For foreign countries the process is regulated by treaty and conducted between the Federal Government of the United States and the government of a foreign country. The process is considerably different from interstate extradition, or interstate rendition, as mandated by Article 4, Section 2, Clause 2 of the United States Constitution.
Interstate extradition 
The Extradition of Fugitives Clause in the Constitution requires States, upon demand of another State, to deliver a fugitive from justice who has committed a "treason, felony or other crime" to the State from which the fugitive has fled. 18 U.S.C. § 3182 sets the process by which an executive of a state, district or territory of the United States must arrest and turn over a fugitive from another state, district or territory.
- An executive authority demand of the jurisdiction to which a person that is a fugitive from justice has fled.
- The requesting executive must produce a copy of an indictment found or an affidavit made before a magistrate of any State or Territory, and
- Such document must charge the fugitive demanded with having committed treason, felony, or other crime, and
- Such document must be certified as authentic by the governor or chief magistrate of the state or territory from whence the person so charged has fled.
- The executive receiving the request must then cause the fugitive to be arrested and secured, and notify the requesting executive authority or agent to receive the fugitive.
- An agent of the executive of the State demanding extradition must appear to receive the prisoner, which must occur within thirty days from time of arrest or the prisoner may be released. (Some states allow longer waiting periods of up to 90 days before release).
- Cases of kidnapping by a parent to another state would see automatic involvement by the US Marshals department.
In Kentucky v. Dennison, decided in 1860, the Supreme Court held that, although the Governor of the asylum state had a constitutional duty to return a fugitive to the demanding state, the federal courts had no authority to enforce this duty. As a result, for more than 100 years, the governor of one state was deemed to have discretion on whether or not he/she would comply with another state’s request for extradition.
In Puerto Rico v. Branstad, the Court overruled Dennison, and held that the Governor of the asylum state has no discretion in performing his or her duty to extradite, whether that duty arises under the Extradition Clause of the Constitution or under the Extradition Act (18 U.S.C. § 3182), and that a federal court may enforce the Governor’s duty to return the fugitive to the demanding state. There are only four grounds upon which the Governor of the asylum state may deny another state’s request for extradition: (1) the extradition documents facially are not in order; (2) the person has not been charged with a crime in the demanding state; (3) the person is not the person named in the extradition documents; or (4) the person is not a fugitive. There appears to be at least one additional exception: if the fugitive is under sentence in the asylum state, he need not be extradited until his punishment in the asylum state is completed.
International extradition 
The United States has extradition treaties with over 100 countries. Of the treaties most are dual criminality treaties with the remaining being list treaties. A list of countries with which the United States has an extradition treaty relationship can be found in the Federal Criminal Code and Rules, following 18 U.S.C. § 3181, but this list may not be completely accurate.
Countries with diplomatic relations but no extradition treaty 
The United States maintains diplomatic relations, but does not have extradition treaties with the following countries: Afghanistan, Algeria, Andorra, Angola, Armenia, Bahrain, Bangladesh, Belarus, Bosnia and Herzegovina, Brunei, Burkina Faso, Burma, Burundi, Cambodia, Cameroon, Cape Verde, the Central African Republic, Chad, China, Comoros, Congo (Kinshasa), Congo (Brazzaville), Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Guinea, Guinea-Bissau, Indonesia, Ivory Coast, Kazakhstan, Kosovo, Kuwait, Laos, Lebanon, Libya, Macedonia, Madagascar, Maldives, Mali, Marshall Islands, Mauritania, Micronesia, Moldova, Mongolia, Montenegro, Morocco, Mozambique, Namibia, Nepal, Niger, Oman, Qatar, Russia, Rwanda, Samoa, São Tomé & Príncipe, Saudi Arabia, Senegal, Serbia, Somalia, Sudan, Syria, Togo, Tunisia, Uganda, Ukraine, United Arab Emirates, Uzbekistan, Vanuatu, Vatican, Vietnam and Yemen.
Procedure for extradition from the United States 
Generally under United States law (18 U.S.C. § 3184), extradition may be granted only pursuant to a treaty. Some countries grant extradition without a treaty, but every such country requires an offer of reciprocity when extradition is accorded in the absence of a treaty. Further, the 1996 amendments to 18 U.S.C. 3181 and 3184 permit the United States to extradite, without regard to the existence of a treaty, persons (other than citizens, nationals or permanent residents of the United States), who have committed crimes of violence against nationals of the United States in foreign countries.
All extradition treaties currently in force require foreign requests for extradition to be submitted through diplomatic channels, usually from the country's embassy in Washington to the Department of State. Many treaties also require that requests for provisional arrest be submitted through diplomatic channels, although some permit provisional arrest requests to be sent directly to the Department of Justice. The Department of State reviews foreign extradition demands to identify any potential foreign policy problems and to ensure that there is a treaty in force between the United States and the country making the request, that the crime or crimes are extraditable offenses, and that the supporting documents are properly certified in accordance with 18 U.S.C. § 3190. If the request is in proper order, an attorney in the State Department's Office of the Legal Adviser prepares a certificate attesting to the existence of the treaty, etc., and forwards it with the original request to the Justice Department's Office of International Affairs. ("OIAS") 
Once the OIA receives a foreign extradition request, it reviews the request for sufficiency and forwards appropriate ones to the United States Attorney's Office for the judicial district in which the fugitive is located. The U.S. Attorney's office then obtains a warrant, and the fugitive is arrested and brought before the magistrate judge or the US district judge. The government opposes bond in extradition cases. Unless the fugitive waives his or her right to a hearing, the court will hold a hearing pursuant to 18 U.S.C. § 3184 to determine whether the fugitive is extraditable. If the court finds the fugitive to be extraditable, it enters an order of extraditability and certifies the record to the Secretary of State, who decides whether to surrender the fugitive to the requesting government. OIA notifies the foreign government and arranges for the transfer of the fugitive to the agents appointed by the requesting country to receive him or her. Although the order following the extradition hearing is not appealable (by either the fugitive or the government), the fugitive may petition for a writ of habeas corpus as soon as the order is issued. The district court's decision on the writ is subject to appeal, and the extradition may be stayed if the court so orders.
Extradition to the United States 
The federal structure of the United States can pose particular problems with respect to extraditions when the police power and the power of foreign relations are held at different levels of the federal hierarchy. For instance, in the United States, most criminal prosecutions occur at the state level, and most foreign relations occurs on the federal level. In fact, under the United States Constitution, foreign countries may not have official treaty relations with sub-national units such as the individual states; rather, they may have treaty relations only with the federal government. As a result, a state that wishes to prosecute an individual located in foreign territory must direct its extradition request through the federal government, which will negotiate the extradition with the requested state. However, due to the constraints of federalism, any conditions on the extradition accepted by the federal government — such as not to impose the death penalty — are not binding on the states.
In the case of Soering v. United Kingdom, the European Court of Human Rights ruled that the United Kingdom was not permitted under its treaty obligations to extradite an individual to the United States, because the United States' federal government was constitutionally unable to offer binding assurances that the death penalty would not be sought in Virginia courts. Ultimately, the Commonwealth of Virginia itself had to offer assurances to the federal government, which passed those assurances on to the United Kingdom, which extradited the individual to the United States.
Less important problems can arise due to differing qualifications for crimes. For instance, in the United States, crossing state lines is a prerequisite for certain federal crimes (otherwise crimes such as murder, etc. are handled by state governments except in certain circumstances such as the killing of a federal official). This transportation clause is absent from the laws of many countries. Extradition treaties or subsequent diplomatic correspondence often include language providing that such criteria should not be taken into account when checking if the crime is one in the country from which extradition should apply.
To clarify the above point, if a person in the United States crosses the borders of the United States to go to another country, then that person has crossed a federal border, and then federal law would apply in addition to state law. Moving across state lines within the US in committing a crime could also potentially create Federal jurisdiction. In addition, taking a flight in the United States subjects one to federal law, as all airports are considered subject to federal jurisdiction.
- 65 U.S. (24 How.) 66 (1860)
- 483 U.S. 219 (1987)
- See also, Alabama ex rel. its Governor & Attorney General v. Engler, 85 F.3d 1205 (6th Cir. 1996) (Governor of Michigan directed to return a fugitive to Alabama)
- 85 F.3d at 1208.
- See People ex rel. Focarile ex rel. McNeil v. Goord, 12 Misc. 3d 981, 819 N.Y.S.2d 815 (Sup. 2006).
- Chapter 209 of the United States Code - Extradition
- 9-15.000 International Extradition and Related Matters Criminal Resource Manual from the United States Attorneys' Manual
- Organization of American States - Extradition
- U.S. Department of State - Independent States in the World
- FreeExistence.org Primer on US Extradition Law