Whether an Alabama prisoner subject to a Kentucky detainer was "in custody" and could use federal habeas corpus to seek enforcement of Kentucky's obligation to provide a speedy trial before a Kentucky conviction had occurred.
Holding
Yes. Braden was in custody for purposes of 28 U.S.C. § 2241(c)(3) and could seek federal habeas relief requiring Kentucky to afford him a prompt trial.
Reasoning
Peyton v. Rowe rejected the former rule that habeas corpus could challenge only a prisoner's current confinement. A prisoner may now challenge future custody, and Kentucky's detainer created the future Kentucky custody Braden attacked.
For this purpose, Alabama held Braden as Kentucky's agent with respect to the Kentucky detainer. Braden's dispute was therefore with Kentucky, whose untried indictment and detainer imposed present practical consequences despite his physical confinement in Alabama.
Braden was not asking a federal court to adjudicate an ordinary defense to the Kentucky charges before trial. He sought enforcement of Kentucky's affirmative constitutional duty, recognized in Smith v. Hooey, to make a diligent, good-faith effort to bring a prisoner in another jurisdiction to trial after the prisoner demands it.
The Court emphasized the narrowness of its ruling. It did not authorize defendants to derail pending state prosecutions by litigating constitutional defenses prematurely in federal habeas proceedings; Braden sought a trial, rather than to forestall one.