Police Lt. Beland conducted a legal search of Richard Kelleher’s motel room and found a number of stolen items that were taken during recent burglaries. The search did not procure, however, jewelry, gold, and silver that were taken. Subsequently, a woman identified as Upton’s (defendant) ex-girlfriend called Beland. The woman told Beland that Upton’s motor home was filled with stolen goods, including jewelry, gold, and silver. The woman also stated that Upton knew of the raid of Kelleher’s motel room and would be moving the motor home soon as a result. She stated that Upton bought the jewelry, gold, and silver from Kelleher. Finally, she stated she had broken up with Upton, and that was why she was providing the information. Beland confirmed that the motor home was parked where the woman said it would be and applied for a search warrant. A magistrate judge issued the search warrant. Upton challenged the constitutionality of the warrant. The United States Supreme Court granted certiorari.