The following excerpt is from Rabiee v. Shasta Cnty. Corr. Facility, No. 2:20-cv-0514 DB P (E.D. Cal. 2020):
other decision already has been determined to be wrongful. See Heck v. Humphrey, 512 U.S. 477, 486-87 (1994). A conviction or sentence may be determined to be wrongful by, for example, being reversed on appeal or being set aside when a state or federal court issues a writ of habeas corpus. See id. The Heck rule also prevents a person from bringing an action that--even if it does not directly challenge the conviction or other decision--would imply that the conviction or other decision was invalid. The practical importance of the Heck rule is that plaintiffs cannot attack their convictions or sentences in a civil rights action for damages and instead must have successfully attacked the decision before filing the civil rights action for damages. The Heck rule requires dismissal of a case where the conviction has occurred.
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