Popoff's methods were definitively exposed in 1986 by the magician and skeptic James Randi and his associate Steve Shaw, an illusionist known professionally as Banachek, with technical assistance from the crime scene analyst and electronics expert Alexander Jason. With computerized radio scanners, Jason was able to demonstrate that Popoff's wife, Elizabeth, was using a wireless radio transmitter to broadcast information that she and her aides had culled from prayer request cards filled out by audience members. Popoff received the transmissions via an earpiece he was wearing and repeated the information to astonished audience members. Jason produced video segments interspersing the intercepted radio transmissions with Popoff's "miraculous" pronouncements.