The board shall keep a copy of a complaint it receives concerning the unprofessional conduct of a licensee for seven years or until the statute of limitations for filing an accusation against a licensee has expired, whichever period is shorter, if the board finds after an investigation that there is insufficient evidence to proceed with disciplinary action.
Source:
Section 2227.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=2227.5..