In addition to and independent of any and all other proper causes for refusal by the commissioner to approve or accept any bond filed or presented for filing with him under any provision of this code or other laws, the commissioner shall decline to approve, accept or file any such bond, if in his opinion, the principal and the surety are affiliated in any manner whereby insolvency of the one party would affect the solvency of the other or whereby it is made uncertain whether or not such result might occur.
Source:
Section 12920.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=INS§ionNum=12920.5..