Exorcism
In Catholic Christianity, exorcisms are performed in the name of Jesus Christ. A distinction is made between a formal exorcism, which can only be conducted by a priest during a baptism or with the permission of a bishop, and "prayers of deliverance" which can be said by anyone.
The Catholic rite for a formal exorcism, called a "Major Exorcism", is given in Section 11 of the Rituale Romanum. The Ritual lists guidelines for conducting an exorcism, and for determining when a formal exorcism is required. Priests are instructed to carefully determine that the nature of the affliction is not actually a psychological or physical illness before proceeding.
The Exorcism of Emily Rose
Moore is called to the stand where he plays the tape. As seen in a flashback, Moore, Emily's father, Jason, and Dr. Cartwright participate in the exorcism while her mother and sisters pray in the living room. During the Lord's Prayer, Emily attacks, causing the family cats to become agitated and attack Moore. As Jason and Cartwright help Moore, Emily escapes from her restraints, leaps out of a window, and flees to the family barn. The others give chase, Moore continuing the exorcism and demanding to know the demon's name. It responds by revealing there are six demons – those who possessed Cain, Nero, and Judas Iscariot, a member of Legion, Belial, and Lucifer himself. The exorcism abruptly ends when the men render aid to Emily's father, injured by runaway horses. Thomas reasons that Emily's behavior can be explained by learning ancient languages at school and her epilepsy.