>> The Exorcist was filmed 45 years ago here on Washington's Georgetown University campus. Now, director William Friedkin is dealing with the devil again. This time, though, it's not a cult classic, and the horror is not fiction, it's real. In a documentary that captures rare footage of the real practice of exorcism.
>> 500 thousand Italians see an exorcist every year.>> It's different. I'm confronting something that's different, that I had not confronted when I made the film. I had never seen an exorcism before I made the movie The Exorcist. This time round, Friedkin did see an exorcism of a 46-year-old architect living in the Italian mountains.
>> She's said to be possessed by the devil. For 31 years, he has exorcised Christina eight times. This will be her ninth.>> Terrifying, tense, very troublesome. I saw her total personality change.>> Unlike the film, there are no special effects or twisting heads. But the allegedly possessed woman writhes and screams in a strange voice.
>> Nobody gets to see this. It's not an entertainment. It's a religious ritual performed by very few people to liberate someone who is possessed.