United States v. Grubbs, Supreme Court of the United States, March 21, 2006 [holding that anticipatory warrants executed at some point in the future are allowed under the Fourth Amendment]. Excerpt:
Because the Fourth Amendment does not require that the triggering condition for an anticipatory search warrant be set forth in the warrant itself, the Court of Appeals erred in invalidating the warrant at issue here.
Read the full text of the opinion [PDF]. Reported in JURIST's Paper Chase here.