Edited sentence: (Critics counter that The Exorcist is a work of fiction based on a case where recent research has cast serious doubt as to its actual authenticity.An example of the alleged dangers of talking boards is the subject of the novel The Exorcist.An in-depth investigation conducted by researcher Mark Opsasnick has revealed that the original story was in fact more than likely a complete hoax).Both the novel and the film of the same name are based on a story of an alleged demonic possession, caused by the use of talking boards.The spirit in this story was allegedly removed by a Roman Catholic exorcist