Whether the Due Process Clause itself gives a convicted prisoner a liberty interest in discretionary parole merely because a State offers the possibility of parole.
Holding
No. The mere existence of a discretionary parole system does not itself create a constitutionally protected liberty interest in release.
Reasoning
A valid criminal conviction constitutionally deprives the defendant of liberty for the duration of the sentence. Thus, a prisoner has no inherent constitutional right to conditional release before that sentence expires, even though release is deeply desired.
The Court distinguished parole release from parole revocation. A parolee facing revocation already possesses conditional freedom in the community; an incarcerated inmate seeking release has only an expectation or hope of obtaining freedom. As the Court put it, there is a meaningful human difference between losing liberty one has and failing to obtain liberty one wants.
The decisions are also different in character. Parole revocation begins with a retrospective factual inquiry into whether the parolee violated a condition. A parole-release decision instead requires a predictive and discretionary assessment of many imponderable factors, including rehabilitation, public safety, deterrence, the offense, and the inmate’s prospects outside prison.