Cal. Code Civ. Proc. § 706.020 : CALIFORNIA CODE OF CIVIL PROCEDURE — OF CIVIL ACTIONS — ENFORCEMENT OF JUDGMENTS — ENFORCEMENT OF MONEY JUDGMENTS — WAGE GARNISHMENT — GENERAL PROVISIONS — Generally

Except for an earning assignment order for support, the earnings of an employee shall not be required to be withheld by an employer for payment of a debt by means of any judicial procedure other than pursuant to this chapter.