California Code, Code of Civil Procedure - CCP § 630.08

(a) By agreeing to participate in the expedited jury trial process, the parties agree to waive any motions for directed verdict, motions to set aside the verdict or any judgment rendered by the jury, or motions for a new trial on the basis of inadequate or excessive damages.

(b) The court shall not set aside any verdict or any judgment, shall not direct that judgment be entered in favor of a party entitled to judgment as a matter of law, and shall not order a new trial, except on the grounds stated in Section 630.09.