Business and Professions Code § 16240

Every person who practices, offers to practice, or advertises any business, trade, profession, occupation, or calling, or who uses any title, sign, initials, card, or device to indicate that he or she is qualified to practice any business, trade, profession, occupation, or calling for which a license, registration, or certificate is required by any law of this state, without holding a current and valid license, registration, or certificate as prescribed by law, is guilty of a misdemeanor.