Peralta v. Vasquez

CALABRESI, Circuit Judge.

This appeal presents a new twist on a familiar issue: What requirements must a *100prisoner meet before he can maintain a claim under 42 U.S.C. § 1983 that challenges sanctions imposed pursuant to a prison disciplinary proceeding? The case law is clear that when a prisoner’s challenge either to the process or the result of a prison disciplinary proceeding necessarily implies the invalidity of a sanction that affects the duration of his sentence, such as the deprivation of good-time credits, the prisoner may not maintain an action under § 1983 unless he has shown that the…