California Code, Business and Professions Code - BPC § 7320.2

Any licensee who uses an X-ray appliance, apparatus or machine in the treatment of any human being or for the purpose of or with the intent to remove superfluous hair from the face or body of any human being, or who applies to any human being a solution of phenol greater than 10 percent, or corrosive sublimate (mercury) or any of its preparations, derivatives, or compounds in a solution greater than one in five hundred, is guilty of a misdemeanor.