California Code of Civil Procedure Section §706.102
(Procedures for Earnings Withholding and Exemptions Claims)
(a) If a writ of execution has been issued to the county where the judgment debtor's employer is to be served and the time specified in subdivision (b) of Section 699.530 for levy on property under the writ has not expired, a judgment creditor may apply for the issuance of an earnings withholding order by filing an application with a levying officer in such county who shall promptly issue an earnings withholding order.
(b) This section does not apply where the earnings withholding order is a withholding order for taxes.
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