Former Sea Org member Maureen Bolstad describes her experienced the Church of Scientology's controversial Purification Rundown. A Medical Doctor signs off that the person can do the Purif, but then, Sea Org members or staff supervise it. .Purification Rundown requires a person to be in a dry sauna five hours per day. A person must also take increasingly high daily doses of niacin until they reach a 5,000mg maximum. I have heard from some credible sources that there is an insistence on continuing the Purif at 5000 Niacin for some time before a person can attest they are done. This is a Miscavige Order. Often OT VIIIs who have done all the levels are re-cyled to re-do their Purifs.