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.
Exorcism in the Catholic Church
The first official guidelines for exorcism were established in 1614 , whereas grimoire were widely known and used since the Ancient period. Those guidelines were later revised by the Vatican in 1999 as the demand for exorcisms increased. In the 15th century, Catholic exorcists were both priestly and lay, since every Christian was considered as having the power to command demons and drive them out in the name of Christ. These exorcists used the Benedictine formula ""Vade retro satana"" ("Step back, Satan") around this time. By the late 1960s, Roman Catholic exorcisms were seldom performed in the United States, but by the mid-1970s, popular film and literature revived interest in the ritual, with thousands claiming demonic possession. Maverick priests who belonged to fringes took advantage of the increase in demand and performed exorcisms with little or no official sanction. The exorcisms that they performed were, according to "Contemporary American Religion", “clandestine, underground affairs, undertaken without the approval of the Catholic Church and without the rigorous psychological screening that the church required. In subsequent years, the Church took more aggressive action on the demon-expulsion front. The practice of exorcism without consent from the Catholic Church is what prompted the official guidelines from 1614 to be amended. The amendment established the procedure that clergy members and each individual who claims to be impacted by demonic possession must follow. This includes the rule that the potentially possessed individual must be evaluated by a medical professional before any other acts are taken. The primary reason for this action is to eliminate any suspicion of mental illness, before the next steps of the procedure are taken. Since demonic possession was extremely rare, and mental health issues are often mistaken for demonic possession, the Vatican requires that each diocese have a specially trained priest who is able to diagnose demonic possession and perform exorcisms when necessary. ” In more recent years, the number of exorcisms has increased, and all dioceses are now required by the Vatican to have a trained exorcist available as needed.