Whether anticipatory search warrants are categorically unconstitutional because the contraband is not yet at the place to be searched when the warrant issues.
Holding
No. Anticipatory warrants are constitutional when probable cause establishes that the triggering condition will occur and that evidence will be found at the specified place when the warrant is executed.
Reasoning
The Fourth Amendment requires probable cause to believe that contraband or evidence of a crime will be found in a particular place. That inquiry is forward-looking: even an ordinary warrant rests on a prediction that evidence presently believed to be at a location will still be there when officers execute the warrant. Anticipatory warrants therefore differ from ordinary warrants only in how openly they rely on a future event.
For an anticipatory warrant subject to a triggering condition, probable cause has two components. The magistrate must have reason to believe both that the triggering condition will occur and that, once it occurs, there is a fair probability that contraband or evidence will be at the designated premises. Otherwise, officers could obtain warrants for any location merely on the possibility that contraband might someday be delivered there.
The affidavit satisfied both requirements here. Grubbs had ordered the videotape, making successful delivery to his residence likely, and delivery of the tape into the residence would establish probable cause to search for it and related evidence there. The magistrate thus had a substantial basis to find probable cause.