The following excerpt is from Dunn v. Swarthout, No. 2:11-cv-2731 JAM GGH P (E.D. Cal. 2014):
A prisoner may challenge a prison disciplinary conviction by petition for writ of habeas corpus if the conviction resulted in the loss of good time credits because credits impact the duration of the prisoner's confinement. Preiser v. Rodriguez, 411 U.S. 475, 487-88, 93 S. Ct. 1827 (1973) (suit seeking restoration of good time credits was "within the core of habeas corpus
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