California Code, Health and Safety Code - HSC § 109295

On written request by the department, delivered personally or by mail, any individual, person, firm, association, or other entity engaged, or representing himself, or itself, as engaged, in the diagnosis, treatment, alleviation, or cure of cancer shall furnish the department with the sample as the department may deem necessary for adequate testing of any drug, medicine, compound, or device used or prescribed by the individual, person, firm, association, or other entity in the diagnosis, treatment, alleviation, or cure of cancer, and shall specify the formula of any drug or compound and name all ingredients by their common or usual names, and shall, upon like request by the department, furnish further necessary information as it may request as to the composition and method of preparation of and the use that any drug, compound, or device is being put by the individual, person, firm, association, or other entity. This section shall apply to any individual, person, firm, association, or other entity that renders health care or services to individuals who have or believe they have cancer. This section also applies to any individual, person, firm, association, or other entity that by implication causes individuals to believe they have cancer.

The failure to either provide the sample, disclose the formula, or name the ingredients as required by this section shall be conclusively presumed that the drug, medicine, compound or device that is the subject of the department's request has no value in the diagnosis, treatment, alleviation, or cure of cancer.