Whether a prisoner is “in custody” under a conviction whose sentence has fully expired merely because that conviction enhanced a later sentence.
Holding
No. The expiration of the sentence ends custody under that conviction, even if the conviction later increases another sentence.
Reasoning
Federal habeas jurisdiction extends only to a person who is “in custody” in violation of federal law. The Court has read that requirement generously: physical imprisonment is unnecessary when a person remains subject to substantial restraints under an unexpired sentence, such as parole conditions. But those cases involved continuing restraints imposed by the sentence being challenged.
Carafas v. LaVallee distinguished jurisdictional custody from the collateral consequences that prevent a case from becoming moot. In Carafas, the petitioner was in custody when he filed, so his later unconditional release did not defeat the case. The Court explained that collateral consequences alone do not establish the statutory custody requirement when the challenged sentence had already expired before filing.
Treating an expired conviction as sufficient custody whenever it could enhance a later sentence would effectively erase the statutory limitation. Because habitual-offender laws and sentence-enhancement regimes are common, prisoners could attack long-expired convictions at any time through habeas corpus. The Court therefore held that Cook was not in custody under his 1958 sentence itself.