Also known as: void-for-vagueness doctrine · void for vagueness · vagueness doctrine · statutory clarity doctrine · due process vagueness
Written by attorneys · grounded in primary & secondary sources — see below
A constitutional doctrine under the Due Process Clause that invalidates statutes failing to provide fair notice of prohibited conduct or explicit standards to prevent arbitrary enforcement.
Valentina Vasquez, a defense lawyer, told reporters that her client would present evidence of police misconduct at trial. The disciplinary board sanctioned her under a publicity rule that barred statements creating a substantial likelihood of prejudice while allowing statements about the general nature of the defense without elaboration. The board could not explain why her comment crossed the line, leaving Vasquez without clear notice of what speech was safe.
Virgil Volpe walked through a commercial district at night. An officer stopped him and demanded credible and reliable identification plus an account of his presence. Volpe could not satisfy the vague standard and faced misdemeanor charges. The statute supplied no objective criteria for what counted as credible identification.
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Victor Vale was arrested under a municipal vagrancy ordinance that defined vagrants as persons wandering without lawful purpose. Officers applied the ordinance to Vale's presence near a bus stop without any observable criminal act. The ordinance supplied no objective criteria separating lawful presence from prohibited conduct.
Valerie Voss entered a store during posted business hours and remained after closing when employees failed to ask her to leave. She was later prosecuted under an ordinance that courts had expanded to cover remaining after hours even without notice. Voss had no way to anticipate that her conduct would be treated as criminal trespass.
Vincent Valdez visited his cousin in public housing and was barred under a rule allowing officers to issue no-trespass notices to nonresidents for any reason. Valdez received no advance notice of the criteria used to decide who could be excluded. The rule left enforcement to the unfettered discretion of individual officers.
Vincent Vale was charged under one of two statutes carrying different penalties for the same firearm possession conduct. The statutes supplied no standard for deciding which charge to bring. Vale faced the risk that prosecutors would select the harsher statute without any statutory guidance.
A statute must give ordinary people fair notice of what conduct is prohibited and must supply explicit standards that constrain law enforcement discretion. Failure on either prong violates due process.
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No. The doctrine also reaches attorney disciplinary rules and quasi-criminal ordinances that impose sanctions or dispersal orders, because those measures likewise threaten liberty interests without fair notice.
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Such ordinances leave the line between lawful presence and prohibited conduct to an officer's subjective assessment of unseen mental states. This supplies neither fair notice to citizens nor meaningful limits on enforcement discretion.
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No. Training on proxies such as sitting without shopping bags still requires officers to infer an unobservable purpose, so the core defect of standardless discretion remains.
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A vague statute impermissibly transfers basic policy decisions to police, judges, and juries on an ad hoc basis, undermining the constitutional requirement that legislatures define crimes with sufficient definiteness.
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…enforcement by failing to provide sufficiently definite guidelines for law enforcement officials. Pp. 355-361. (a) Although the void-for-vagueness doctrine requires that a penal statute define the criminal offense with sufficient definiteness that ordinary people can understand what conduct is prohibited and in a manner that does not encourage…