California Code, Health and Safety Code - HSC § 103871.1

(a) A person with a valid scientific interest who is engaged in demographic, epidemiological, or other similar studies related to health who meets qualifications as determined by the department, and who agrees, in writing, to maintain confidentiality, may be authorized access to confidential information collected by the department pursuant to Section 103871.

(b) The department may enter into agreements to furnish confidential information to other states' neurodegenerative disease registries, federal neurodegenerative disease control agencies, local health officers, or health researchers for the study of neurodegenerative diseases. Before confidential information is disclosed to those agencies, officers, researchers, or out-of-state registries, the requesting entity shall agree in writing to maintain the confidentiality of the information, and in the case of researchers, shall also do both of the following:

(c) Notwithstanding any other law, a disclosure authorized by this section shall include only the information necessary for the stated purpose of the requested disclosure, used for the approved purpose, and not be further disclosed.

(d) The furnishing of confidential information to the department or its authorized representative in accordance with this section shall not expose any person, agency, or entity furnishing information to liability, and shall not be considered a waiver of any privilege or a violation of a confidential relationship.

(f) Notwithstanding any other law, the confidential information shall not be available for subpoena, shall not be disclosed, discoverable, or compelled to be produced in any civil or administrative proceeding, or other similar proceeding. The confidential information shall not be deemed admissible as evidence in any civil or administrative proceeding, or other similar tribunal or court for any reason.

(g) This section does not preempt the authority of a facility or an individual providing diagnostic or treatment services to a patient with a neurodegenerative disease to maintain their own facility-based neurodegenerative disease registry.