Exorcism
In Christianity, exorcism is the practice of casting out demons. In Christian practice the person performing the exorcism, known as an exorcist, is often a member of the Christian Church, or an individual thought to be graced with special powers or skills. The exorcist may use prayers and religious material, such as set formulas, gestures, symbols, icons, amulets, etc. The exorcist often invokes God, Jesus and/or several different angels and archangels to intervene with the exorcism. Protestant Christian exorcists most commonly believe the authority given to them by the Father, Son, and Holy Spirit (the Trinity) is the source of their ability to cast out demons.
Gabriele Amorth
Amorth was also interviewed for the second episode of "True Horror with Anthony Head", presented by Anthony Head. He explained he would never perform an exorcism based solely on someone's claims of possession; always directs people to psychiatrists and doctors first, and that when he sees someone is not possessed but the person still insists, he replies: "You have no devil. If you have a problem, talk to a good vet."