Motor carriers who contract or subcontract transportation service for other motor carriers shall retain all required records relating to the dispatch of vehicles and drivers and the pay of drivers that are not required to be retained by the carrier for whom the contracted or subcontracted service is performed.
Source:
Section 34505.10, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=34505.10..