Article Four of the United States Constitution
In Kentucky v. Dennison (1860), the Supreme Court held that the federal courts may not compel state governors to surrender fugitives through the issue of writs of mandamus. The Dennison decision was overruled by Puerto Rico v. Branstad (1987). Now, the federal courts may require the extradition of fugitives. Alleged fugitives generally may not challenge extradition proceedings.