Richard Gallagher, a board-certified psychiatrist and a professor of clinical psychiatry at New York Medical College, writes in the Washington Post about his consultations on exorcisms.
I'm glad they just let him write it instead of filtering his story through some biased reporter.
I’m a man of science and a lover of history; after studying the classics at Princeton, I trained in psychiatry at Yale and in psychoanalysis at Columbia. That background is why a Catholic priest had asked my professional opinion, which I offered pro bono, about whether this woman was suffering from a mental disorder. This was at the height of the national panic about Satanism. (In a case that helped induce the hysteria, Virginia McMartin and others had recently been charged with alleged Satanic ritual abuse at a Los Angeles preschool; the charges were later dropped.) So I was inclined to skepticism. But my subject’s behavior exceeded what I could explain with my training. She could tell some people their secret weaknesses, such as undue pride. She knew how individuals she’d never known had died, including my mother and her fatal case of ovarian cancer. Six people later vouched to me that, during her exorcisms, they heard her speaking multiple languages, including Latin, completely unfamiliar to her outside of her trances. This was not psychosis; it was what I can only describe as paranormal ability. I concluded that she was possessed. Much later, she permitted me to tell her story.
The priest who had asked for my opinion of this bizarre case was the most experienced exorcist in the country at the time, an erudite and sensible man. I had told him that, even as a practicing Catholic, I wasn’t likely to go in for a lot of hocus-pocus. “Well,” he replied, “unless we thought you were not easily fooled, we would hardly have wanted you to assist us.”
You can read the whole thing at the WaPo.