All identifying information regarding individual patients, health care facilities and practitioners reported pursuant to ORS 432.520 (Reporting requirement) shall be confidential and privileged. Except as required in connection with the administration or enforcement of public health laws or rules, no public health official, employee or agent shall be examined in an administrative or judicial proceeding as to the existence or contents of data collected under the registry system for cancer and benign or borderline tumors of the brain and central nervous system.