US Code 3184

, as modified by the 456 Amendment, was the law Rex Matheson cited as his basis for the rendition of Jack Harkness, Gwen Cooper and, apparently, Rhys and Anwen Williams. (TW: The New World)

Behind the scenes
In the real world, the full reference for this law — which actually does address extradition of criminals from other countries to the United States— is Title 18 US Code, Part II, Chapter 209, § 3184. The "456 Amendment" is, of course, purely fictional.

External link

 * Cornell University Law School notes on § 3184