In addition to the witness fees and mileage provided by Section 11450.40 of the Government Code, the department may pay actual, necessary, and reasonable expenses in an amount not to exceed the per diem allowance payable to a nonrepresented state employee on travel status. The department may pay witness expenses in advance of the hearing.
Source:
Section 1551.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=1551.5..