“Carrier donor” means any donor of human whole blood whose blood donation has been found, either by laboratory tests or by the tracing of a transfusion-associated hepatitis case where there was a single donor, to contain viral hepatitis, or any donor of human whole blood who has twice been determined by the department to be a possible carrier donor.
Source:
Section 1600.7, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=1600.7..