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 Office of International Affairs.
[cited in USAM 9-15.700]