All persons inspecting conveyances shall first secure from the division a certificate of competency to make those inspections. The division may determine the competency of any applicant for the certificate, either by examination or by other satisfactory proof of qualifications. The division may rescind at any time, upon good cause being shown therefor, and after hearing, if requested, any certificate of competency issued by it to a conveyance inspector.
Ca. Lab. Code § 7311