Summary

Portrait of John Paul Stevens John Paul Stevens Horton v. California — Opinion of the Court

If the interest in privacy has been invaded, the violation must have occurred before the object came into plain view and there is no need for an inadvertence limitation on seizures to condemn it. The prohibition against general searches and general warrants serves primarily as a protection against unjustified intrusions on privacy. But reliance on privacy concerns that support that prohibition is misplaced when the inquiry concerns the scope of an exception that merely authorizes an officer with a lawful right of access to an item to seize it without a warrant.
Source: Wikisource

Portrait of John Paul Stevens John Paul Stevens Horton v. California — Opinion of the Court

The fact that an officer is interested in an item of evidence and fully expects to find it in the course of a search should not invalidate its seizure if the search is confined in area and duration by the terms of a warrant or a valid exception to the warrant requirement. If the officer has knowledge approaching certainty that the item will be found, we see no reason why he or she would deliberately omit a particular description of the item to be seized from the application for a search warrant.
Source: Wikisource

Portrait of John Paul Stevens John Paul Stevens Horton v. California — Opinion of the Court

The rationale of the exception to the warrant requirement, as just stated, is that a plain-view seizure will not turn an initially valid (and therefore limited) search into a 'general' one, while the inconvenience of procuring a warrant to cover an inadvertent discovery is great. But where the discovery is anticipated, where the police know in advance the location of the evidence and intend to seize it, the situation is altogether different.
Source: Wikisource

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