Vatican has a strict protocol when it comes to it. You don't get an exorcism just by calling and getting an appointment that's not how it works. And there's a very limited number of exorcists. I think it's a total of 12 for the US. Protocol involves the review of the subject's medical history and psychiatrists in order to rule out any other possibility other than actual demonic possession. A catholic priest isn't allowed to perform an exorcism without the vatican's authorization. If memory serves, it's something like 1 case out of 5000 reported case, that is accepted as demonic possession, the rest are ruled out as something else such as mental illness. https://en.wikipedia.org/wiki/Exorcism_in_the_Catholic_Church#When_an_exorcism_is_needed When an exorcism is needed According to the Vatican's guidelines issued in 1999, "the person who claims to be possessed must be evaluated by doctors to rule out a mental or physical illness".[7] Most reported cases do not require an exorcism because twentieth-century Catholic officials regard genuine demonic possession as an extremely rare phenomenon that is easily confounded with natural mental disturbances. As the demand for exorcisms has increased over the past few decades, the number of trained exorcists has also risen. In prior times, exorcists were kept fairly anonymous, and the performance of exorcisms remained a secret. Some exorcists attribute the rise in demand of exorcisms to the rise in drug abuse and violence, which leads to the suggestion that such things might work hand in hand. Many times a person just needs spiritual or medical help, especially if drugs or other addictions are present. The specially trained priest and medical professionals will be able to work together to address the patient, and be able to determine what type of illness the patient is suffering from. After the need of the person has been determined then the appropriate help will be met. In the circumstance of spiritual help, prayers may be offered, or the laying on of hands or a counseling session may be prescribed. The exorcist might not perform an exorcism if he does not know the person. Signs Signs of demonic invasion vary depending on the type of demon and its purpose, including: Loss or lack of appetite Cutting, scratching, and biting of skin A cold feeling in the room Unnatural bodily postures and change in the person's face and body The possessed losing control of their normal personality and entering into a frenzy or rage, and / or attacking others Change in the person's voice Supernatural physical strength not subject to the person's build or age Speaking in tongues the person cannot have learned before Knowledge of past events the person cannot have known about, knowledge of present events the person is not witnessing or having knowledge about and prediction of future events that become accurate (sometimes through dreams) Levitation and moving of objects / things Expelling of objects / things / certain animals Intense hatred / aversion and violent reaction toward all religious objects or items Antipathy towards entering a church, speaking Jesus's name, or hearing scripture