My understanding of Roman Catholic protocol is that they won't even interview a subject until an unbiased psychiatric evaluation has ruled out any mental illness.
If you have any aquaintences who are extreme rabid lefties, ask them if they will look you in the eye and say, "Jesus Christ is Lord" or, alternately, "Jesus Christ is come in the flesh."
You'll see some interesting reactions. If they can see through their rage they sometimes cannot stay in the same room where His names is spoken.
But before I knew this the salesperson in the Front would look all around me. Then call me goody two shoes. He would mock me. So eventually I would plead the blood of Christ. He would walk away until I was done in the store. Some times with a small snarl. Just remember these days are getting weird. The blood of Cavalry! Praise Jesus!
I have read many exorcist articles and books over the years. Basically that can be the rule but there are exceptions. I have read about a few priest in a Rome church where people from Italy or the world go to be delivered. These priests are so attuned to the spirit they can tell right away. They do it almost everyday with lines. Just by the massive experience.
Also remember according to one book people can be both mentally ill and possessed. But you have to have some patience. I remember reading about Smith Wigglesworth He once delivered by just singing Jesus with others. Then another time took days to deliver.
That only proves the fact that demoncrats, and liberals, are pure and unadulterated evil.