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“Assuming a credible threat of prosecution, a plaintiff can bring an action to challenge a local law as violating the Constitution and to prevent that law’s future enforcement,” Kagan wrote.
Heck v. Humphrey set a precedent holding that a person can’t sue to overturn a prior conviction. Olivier’s case challenged that precedent.
Kagan said that a lawsuit asking for future help with an activity, like Olivier exercising his First Amendment rights, was valid under the court’s rules
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