Cal. PEN § 926

(a) If, in the judgment of the grand jury, the services of one or more experts are necessary for the purposes of Sections 925, 925a, 928, 933.1, and 933.5 or any of them, the grand jury may employ one or more experts, at an agreed compensation, to be first approved by the court. If, in the judgment of the grand jury, the services of assistants to such experts are required, the grand jury may employ such assistants, at a compensation to be agreed upon and approved by the court. Expenditures for the services of experts and assistants for the purposes of Section 933.5 shall not exceed the sum of thirty thousand dollars ($30,000) annually, unless such expenditures shall also be approved by the board of supervisors.

(b) When making an examination of the books, records, accounts, and documents maintained and processed by the county assessor, the grand jury, with the consent of the board of supervisors, may employ expert auditors or appraisers to assist in the examination. Auditors and appraisers, while performing pursuant to the directive of the grand jury, shall have access to all records and documents that may be inspected by the grand jury subject to the same limitations on public disclosure as apply to the grand jury.

(c) Any contract entered into by a grand jury pursuant to this section may include services to be performed after the discharge of the jury, but in no event may a jury contract for services to be performed later than six months after the end of the fiscal year during which the jury was impaneled.

(d) Any contract entered into by a grand jury pursuant to this section shall stipulate that the product of that contract shall be delivered on or before a time certain to the then-current grand jury of that county for such use as that jury finds appropriate to its adopted objectives.