Cal. Gov. Code § 4526
Notwithstanding any other provision of law, selection by a state or local agency head for professional services of private architectural, landscape architectural, engineering, environmental, land surveying, or construction project management firms shall be on the basis of demonstrated competence and on the professional qualifications necessary for the satisfactory performance of the services required. In order to implement this method of selection, state agency heads contracting for private architectural, landscape architectural, professional engineering, environmental, land surveying, and construction project management services shall adopt by regulation, and local agency heads contracting for private architectural, landscape architectural, professional engineering, environmental, land surveying, and construction project management services may adopt by ordinance, procedures that assure that these services are engaged on the basis of demonstrated competence and qualifications for the types of services to be performed and at fair and reasonable prices to the public agencies. Furthermore, these procedures shall assure maximum participation of small business firms, as defined by the Director of General Services pursuant to Section 14837.
In addition, these procedures shall specifically prohibit practices which might result in unlawful activity including, but not limited to, rebates, kickbacks, or other unlawful consideration, and shall specifically prohibit government agency employees from participating in the selection process when those employees have a relationship with a person or business entity seeking a contract under this section which would subject those employees to the prohibition of Section 87100.
Ca. Gov. Code § 4526