The Purification Rundown, also known as the Purif or the Hubbard Method, is a detoxification program which involves heat exposure for up to 5 hours a day and can exceed 4 weeks in length. It was developed by Scientology's founder L. Ron Hubbard and used by the Church of Scientology as an introductory service. Scientologists consider it the only effective way to deal with the long-term effects of drug abuse or toxic exposure. It forms the basis for drug rehabilitation and detoxification programs operated by church-affiliated groups such as Narconon, Criminon, Second Chance, and the International Academy of Detoxification Specialists. The program combines exercise, dietary supplements and long stays in a sauna (up to five hours a day for five weeks). It is promoted variously as religious or secular, medical or purely spiritual, depending on context. Scientology itself defines the program as the following on their website: "In the 1970s, while working with cases that had previously used drugs, Mr. Hubbard’s research revealed that LSD stays in the system for years after ingestion, lodging in the fatty tissues of the body. Months or even years later, a person can re-experience a “trip” as LSD residues dislodge from the fatty tissue. Subsequent research revealed that a long list of other street drugs, chemical poisons, toxic substances and medical drugs can similarly lodge in the body and cause a person to re-experience their effects. In answer, Mr. Hubbard developed the Purification Rundown to meet a growing threat to spiritual advancement and well-being stemming from the more and more common use of drugs and biochemical substances in the current culture. The Purification Rundown is a tightly supervised regimen of exercise, sauna and nutrition. It is conducted in a properly ordered schedule to include sufficient rest. In combination, it results in the elimination of drug residues and other toxins from the body’s fatty tissues. The Purification Rundown and its underlying discoveries have enabled hundreds of thousands to free themselves from the harmful effects of drugs and toxins and so achieve spiritual gains." Hubbard put forward his ideas about niacin in a book called All About Radiation. He claimed to have discovered that large doses of vitamins could both alleviate and prevent radiation sickness. The 1979 predecessor of the Purification Rundown was known as the "Sweat Program" and was similarly designed to remove traces of LSD which, according to Hubbard, remained for long periods in