Cal. Bus. & Prof. Code § 582

No person, company, or association shall use or attempt to use any diploma, certificate, transcript, or any other writing which has been purchased, fraudulently issued, illegally obtained, counterfeited, or materially altered, either as a certificate or as to character or color of certificate, to practice as a physician and surgeon, podiatrist, osteopathic physician, or a chiropractor, or to practice any other system or mode of treating the sick or afflicted, as provided in the Medical Practice Act, Chapter 5 (commencing with Section 2000) or to practice as any other licentiate under this division.