A piece of paper signed by a judge permitting the authorities to search a particular place.  The search warrant generally must be supported by an affidavit which sets forth the basis for an officer's belief that evidence might be found at the place to be searched.  If a person's home or office is searched pursuant to a search warrant, he or she should generally cooperate with the search, not answer any questions, request a copy of the warrant and any supporting documents, and contact a criminal defense attorney right away.