Rinn became disillusioned with the AmericanSociety for Psychical Research as he believed they had failed to expose cases of psychic fraud so in 1905 he formed a skeptical group known as the Metropolitan Psychical Society. Notable skeptical members who were also magicians included Winfield S. Davis and James L. Kellogg. In January, 1910 a series of séance sittings were held in the physics laboratory at Columbia University with the mediumEusapia Palladino. Scientists such as Robert W. Wood and Edmund Beecher Wilson attended. Davis, Kellogg, Rinn and John W. Sargent, a past-president of the Society of American Magicians were present in the last séance sittings in April. They discovered that Palladino had freed her left foot to perform the phenomena. Rinn gave a full account of fraudulent behavior observed in a séance of Palladino.
Reception
Rinn's book Searchlight on Psychical Research was described in a review as the "death knell of spiritualism" as it exposed the fraud and tricks involved in spiritualist activities. In the book A Skeptic's Handbook of Parapsychology, authors Gerd H. Hövelmann, Marcello Truzzi and Piet Hein Hoebens described the book as:
A flawed but nonetheless very important critical work by a man prominent in conjuring circles who has given us material in this that today appears nowhere else. Because Rinn deals with his own direct experiences and, especially, because he quotes at length from now obscure and forgotten newspaper records, the book is invaluable. It is a book full of opinions, gossip, and anecdotes, and it needs to be read that way — not as a work of objective scholarship. Aside from its wealth of detail, the book is also an important document showing the outlook of a strong skeptic.
Biographer William Lindsay Gresham noted that the book did contain inaccuracies but is valuable for its reprinting of clippings dealing with Harry Houdini. Skeptic Melvin Harris wrote that the book has "many faults and inaccuracies, but for all that, it offers many hints to investigators and points researchers in many fruitful directions." Commenting in 2013, Daniel Loxton has described the book as the "deepest and most important sources of skeptical literature on paranormal investigation from about 1890–1950."
Publications
Sixty Years of Psychical Research: Houdini and I Among the Spiritualists. Reprinted in England as Searchlight on Psychical Research