The department may adopt regulations specifying, in addition to any cause provided by statute, the circumstances which are grounds for the suspension or revocation of a schoolbus, school pupil activity, youth busdriver, farm labor vehicle, or general public paratransit vehicle certificate.
Source:
Section 12806.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=12806.5..