California Code, Labor Code - LAB § 404

(a) Is not subject to enforcement of a money judgment except in an action between the employer and the employee or applicant, or their successors or assigns.

(b) Shall be returned to the employee or applicant together with accrued interest thereon, immediately upon the return of the money or property entrusted to the employee or applicant and upon the fulfillment of the agreement, subject only to the deduction necessary to balance accounts between the employer and employee or applicant.