 Flint accused of using prerecorded tapes to produce voices, as well as live accomplices providing a two-way voice channels.Parapsychologists from the Society for Psychical Research who attended séances with Flint also claimed he was using ventriloquism to produce the voices that they had heard.Researcher Melvin Harris examined the tapes of Flint's direct-voice mediumship and wrote "I have to conclude that his spirits are awfully mixed up.