Wiegand card technology is a patented technology using embedded ferromagnetic wires strategically positioned to create a unique pattern that generates the identification number. Like magnetic stripe or barcode technology, this card must be swiped through a reader to be read. Unlike the other technologies, the identification media is embedded in the card and not susceptible to wear. This technology once gained popularity because it is difficult to duplicate, creating a high perception of security. This technology is being replaced by proximity cards, however, because of the limited source of supply, the relatively better tamper resistance of proximity readers, and the convenience of the touch-less functionality in proximity readers. 

The article about this phenomenon in Encyclopædia Britannica places emphasis that "… one by one spiritual mediums were convicted of fraud, sometimes using the tricks borrowed from scenic "magicians" to convince their paranormal abilities". In the article it is also noted that "… the opening of the wide ranging fraud happening on spiritualistic sessions caused serious damage to reputation of the movement of a Spiritualism and in the USA pushed it on the public periphery".[205]

2.	Let the psychic guide the session. You’re paying a professional psychic for their time; allow them to do their job and lead the discussion where it needs to go. A good psychic should do most of the talking and asking you to validate or confirm the impressions they receive. You will likely frustrate an authentic psychic with your emotional overload by going off on tangents or venting your life story. And you’ll be giving a fraudulent psychic way too much information that can be manipulated to their advantage. When in doubt, politely ask the psychic if you may elaborate to underscore a point. 

The medium Henry Slade was caught in fraud many times throughout his career. In a séance in 1876 in London Ray Lankester and Bryan Donkin snatched his slate before the "spirit" message was supposed to be written, and found the writing already there.[75] Slade also played an accordion with one hand under the table and claimed spirits would play it. The magician Chung Ling Soo revealed how Slade had performed the trick.[76]


4. Are you booked with a psychic or a medium? All mediums are psychic but not every psychic is a medium. A medium is someone who can willfully connect with one or more of your loved ones who have passed on; a psychic is someone who specializes in communicating intuitive information about your life, relationships and your future. Find out in advance if the practitioner with whom you’d like to book a session is a psychic, a medium, or both. It will aid you in tempering your expectations. As before, go in open-minded. While it’s okay to have expectations of wanting to hear from a loved one, don’t be surprised if your deceased alcoholic uncle who abused you when you were a kid comes through instead. This tends to be the way things work spiritually, and the communication from the uncle could very well be exactly what you’re intended to receive as it pertains to healing your family and life in general.
Many 19th century mediums were discovered to be engaged in fraud.[61] While advocates of mediumship claim that their experiences are genuine, the Encyclopædia Britannica article on spiritualism notes in reference to a case in the 19th century that "...one by one, the Spiritualist mediums were discovered to be engaged in fraud, sometimes employing the techniques of stage magicians in their attempts to convince people of their clairvoyant powers." The article also notes that "the exposure of widespread fraud within the spiritualist movement severely damaged its reputation and pushed it to the fringes of society in the United States."[62]
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