## Facts

- Arkansas officers obtained a warrant to search Sharlene Wilson’s home and arrest her on drug-related charges.
- Officers entered by opening an unlocked screen door and going inside without first knocking.
- As officers crossed the threshold, they announced they were police and had a warrant.
- Police recovered drugs, drug paraphernalia, and a firearm; Wilson was found in the bathroom attempting to flush marijuana.
- Wilson moved to suppress the evidence, arguing the entry violated the common-law knock-and-announce requirement.
- The trial court denied suppression, and the Arkansas Supreme Court affirmed, holding the knock-and-announce principle was not required by the Fourth Amendment.

## Issues

1. Whether the Fourth Amendment’s prohibition on unreasonable searches and seizures incorporates the common-law knock-and-announce principle when executing a warrant at a dwelling.
2. Whether an unannounced entry can render an otherwise warrant-based home search unreasonable under the Fourth Amendment.

## Decision

- The Supreme Court reversed and remanded in a unanimous opinion by Justice Thomas.
- The Court held that the common-law knock-and-announce principle is part of the Fourth Amendment reasonableness inquiry for home entries.
- The Court rejected a categorical rule requiring announcement in every case.
- The Court remanded for state courts to determine whether officers’ reasons for entering without prior announcement made the entry reasonable under the circumstances.

## Legal Principles

- The Fourth Amendment’s “reasonableness” analysis for executing a warrant at a home includes consideration of whether officers knocked and announced their presence and authority before entry.
- Knock-and-announce is a factor in reasonableness, not a per se constitutional command whose violation automatically invalidates a search.
- Officers may dispense with announcement when countervailing law-enforcement interests make an unannounced entry reasonable, including:
  - a threat of physical harm to officers,
  - pursuit of a recently escaped arrestee, or
  - reason to believe evidence would likely be destroyed if advance notice were given.
- Lower courts must evaluate asserted justifications case by case within the Fourth Amendment reasonableness framework.

## Conclusion

The Court held that the knock-and-announce requirement, rooted in common law, must be considered in judging the reasonableness of a home entry under the Fourth Amendment, while allowing exceptions when safety or evidence-preservation concerns justify an unannounced entry.


Wilson v. Arkansas, 514 U.S. 927 (1995)