 Randi then replayed the video, but with some of the sound dubbed in that he and his investigating team captured during the event using a radio scanner and recorder.Their scanner had detected the radio frequency Popoff's wife Elizabeth was using backstage to broadcast directions and information to a miniature radio receiver hidden in Popoff's left ear.That information had been gathered by Popoff's assistants, who had handed out "prayer cards" to the audience before the show, instructing them to write down all the information Popoff would need to pray for them.