Whether Spencer's release from custody after filing his habeas petition eliminated the habeas statute's "in custody" requirement.
Holding
No. A petitioner need only be in custody when the habeas petition is filed.
Reasoning
The District Court erred in treating Spencer's later release as a failure of the statutory custody requirement. Spencer was incarcerated because of the parole revocation when he filed his § 2254 petition, and that is all the statute requires under Carafas v. LaVallee and Maleng v. Cook.
The statutory custody requirement did not resolve the case, however. Article III requires a live case or controversy throughout the litigation, so Spencer still had to show a continuing, redressable injury after his parole term and underlying sentence had expired.