A citation under Section 7028.7 shall be issued by the registrar within four years after the act or omission that is the basis for the citation or within 18 months after the date of the filing of the complaint with the registrar, whichever is later.
Source:
Section 7028.9, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=7028.9..