California Constitution Article VI, Section 13

No judgment shall be set aside, or new trial granted, in any cause, on the ground of misdirection of the jury, or of the improper admission or rejection of evidence, or for any error as to any matter of pleading, or for any error as to any matter of procedure, unless, after an examination of the entire cause, including the evidence, the court shall be of the opinion that the error complained of has resulted in a miscarriage of justice. (Sec. 13 added Nov. 8, 1966, by Prop. 1-a. Res.Ch. 139, 1966 1st Ex. Sess.)