California Code, Penal Code - PEN § 116

Every person who adds any names to the list of persons selected to serve as jurors for the county, either by placing the names in the jury box or otherwise, or extracts any name therefrom, or destroys the jury box or any of the pieces of paper containing the names of jurors, or mutilates or defaces the names so that they cannot be read, or changes the names on the pieces of paper, except in cases allowed by law, is guilty of a felony.