Burmese folk religion
These exorcists, or "ahletan hsaya", are said to possess powers that can fend away or challenge these evil demons. These exorcists were often seen as very holy, because they had to be to combat troublesome spirits. They attempt exorcisms by giving the nat offerings. As an interesting overlap with Buddhism, exorcisms can be performed by holding the Buddha up to the possessed person, in an effort to have the Nat flee. If the exorcist cannot banish this spirit alone, they often ask for the assistance of the nat-kadaw. Sorcerers, or "weikzas" also harnessed the power of these nats through many complex rituals, to gain their own supernatural powers.
Exorcism in Christianity
The traditional method for determining if a person needs a deliverance is done by having someone present who has the gift of discerning of spirits. This is a gift of the Holy Spirit from 1 Corinthians 12 that allows a person to "sense" in some way an evil presence. While the initial diagnosis is usually uncontested by the congregation, when many people are endowed with this gift in a single congregation, results may vary.