One of the main prophets and/or leaders in the Kansas City Prophets movement was Bob Jones (no relation to Bob Jones of Bob Jones University in South Carolina), the movement's visionary.  He was said to have been specially anointed with supernatural visions from the Lord and a prophetic gift.  However, he was quoted as saying that the general level of prophetic revelation in the movement's "prophets" had an accuracy level of about 65 percent.  He said some prophets were as low as 10 percent accurate, with some of the "most mature" prophets having a rating "approaching 85 percent to 95 percent." [1]

Deuteronomy 18:20-23 is the test of a prophet in the OT. A biblical prophet has an accuracy rate of 100 percent.