Exodus 22:18 - Suffer not a witch to live. This verse has many modern day rendering, but non calls for compasionate treatment of anyone suspected of witchcraft. The witch hunt and burning in Europe and Americas were all inspired directly by this verse. This is still happening is some parts of the world.
between, what is the acid-test for detecting the "genuine witch" from the "charlatan witch"?
Moral - Beware of the dangers of fundamentalism.
See also:
http://www.nairaland.com/nigeria/topic-118745.0.html