Cal. Health & Safety Code § 103865
(d)
(f)
(4) The department and any regional Parkinson’s disease registry designated by the department may enter into agreements to furnish confidential information to other states’ Parkinson’s disease registries, federal Parkinson’s disease control agencies, local health officers, or health researchers for the purposes of determining the sources of Parkinson’s disease and evaluating measures designed to eliminate, alleviate, or ameliorate their effect. 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: