Peterson pleaded guilty December 8, 2009, to one felony count each of the unauthorized practice of medicine, operating a health care service plan (HMO) without a license, and offering unapproved drugs for cancer treatment.
Peterson was sentenced to nine months in jail, five years probation, and is prohibited from working in any medical field or selling any vitamins or pharmaceuticals for the duration of his probation.
Peterson claimed to heal serious or incurable diseases including cancer and AIDS.
Prosecutors say he also offered patients unapproved drugs for cancer treatment.
In order to practice medicine in California, a doctor must pass comprehensive medical exams and be licensed by the state to practice medicine and dispense prescriptions.
Peterson falsely claimed to be a doctor with a Ph.D. diploma from Canterbury University.
Orange County investigators say Canterbury University is not a real learning institution. They also say Peterson's diploma was obtained by paying $180 on the Internet.