Today "demonstration of mediumship" is part of the church service at all churches affiliated with the National Spiritualist Association of Churches (NSAC) and the Spiritualists' National Union (SNU). Demonstration links to NSAC's Declaration of Principal #9. "We affirm that the precepts of Prophecy and Healing are Divine attributes proven through Mediumship."

The company that hired me boasted they only hire two out of 100 potential psychics. I felt excited, nervous, and mostly terrified I'd be exposed as a fraud. I was confident enough dealing with strangers at parties whom I'd probably never see again, but now I had an entire corporation to report to. They let me pick my psychic name and I did my best to choose something less stripper, more gypsy (which I'd love to reveal but cannot due to an ironclad NDA).
In 1880 the American stage mentalist Washington Irving Bishop published a book revealing how mediums would use secret codes as the trick for their clairvoyant readings.[84] The Seybert Commission was a group of faculty at the University of Pennsylvania who in 1884–1887 exposed fraudulent mediums such as Pierre L. O. A. Keeler and Henry Slade.[85] The Fox sisters confessed to fraud in 1888. Margaret Fox revealed that she and her sister had produced the "spirit" rappings by cracking their toe joints.[86]
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