A witness, other than an officer or employee of the state or of a political subdivision of the state, who appears by order of the board or its executive director, shall receive for his or her attendance the same fees and the same mileage allowed by law to witnesses in civil cases. The amount shall be paid by the party at whose request the witness is subpoenaed. The mileage and fees, if any, of a witness subpoenaed by the board or its executive director, but not at the request of a party, shall be paid from the funds provided for the use of the board in the same manner that other expenses of the board are paid.
Source:
Section 3050.3, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=3050.3..