What are the search warrant requirements in Missouri?
Missouri's warrant procedure is in Chapter 542 of the Revised Statutes, with state constitutional protection under art. I § 15.
1. Constitutional Foundation
The Fourth Amendment is supplemented by Mo. Const. art. I § 15. Missouri courts generally interpret § 15 in lockstep with the Fourth Amendment but enforce it independently (State v. Oliver). Article I § 15 was amended in 2014 to explicitly protect electronic communications and data.
2. Probable Cause & Affidavit
Mo. Rev. Stat. § 542.276 requires a sworn written application stating facts establishing probable cause. The warrant must particularly describe the place and items (§ 542.276). Missouri applies the Gates totality test. Anticipatory warrants are recognized.
3. Who Issues
Section 542.266 authorizes any judge of a circuit court — including associate circuit judges — within whose territorial jurisdiction the property is located. The issuer must be neutral and detached.
4. Execution
Mo. Rev. Stat. § 542.291 codifies knock-and-announce: officers may break open doors only after notice of authority and purpose and refusal. No-knock authorization requires a showing of danger or destruction (State v. Dawson). Section 542.286 requires execution within 10 days. Nighttime execution is permitted unless restricted by the warrant.
5. Scope & Plain View
Search is limited to areas where listed items could reasonably be hidden. Plain-view seizure is permitted when officers are lawfully present and incriminating nature is immediately apparent (Horton v. California).
6. Exceptions to the Warrant Requirement
Consent, search incident to arrest, exigent circumstances, automobile (Carroll), inventory, protective sweep, and Terry frisk.
7. Suppression
Section 542.296 provides the statutory motion-to-suppress framework. Missouri recognizes the Leon good-faith exception (State v. Sweeney) and generally tracks federal exclusionary doctrine.
This is legal information, not legal advice.
- Evidence seized via a no-knock warrant without sufficient justification
- Items seized outside the warrant's particular description
- An anticipatory warrant was executed before the triggering condition occurred
- Mo. Rev. Stat. § 542.266 et seq.
- Mo. Rev. Stat. § 542.276
- Mo. Rev. Stat. § 542.286
- Mo. Rev. Stat. § 542.291
- Mo. Rev. Stat. § 542.296
- U.S. Const. amend. IV
- Mo. Const. art. I § 15
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.