Cal. Welf. and Inst. Code § 707.4
In any case arising under this article in which there is no conviction in the criminal court, the clerk of the criminal court shall report such disposition to the juvenile court, to the probation department, to the law enforcement agency which arrested the minor for the offense which resulted in his remand to criminal court, and to the Department of Justice. Unless the minor has had a prior conviction in a criminal court, the clerk of the criminal court shall deliver to the clerk of the juvenile court all copies of the minor's record in criminal court and shall obliterate the minor's name from any index or minute book maintained in the criminal court. The clerk of the juvenile court shall maintain the minor's criminal court record as provided by Article 22 (commencing with Section 825) of this chapter until such time as the juvenile court may issue an order that they be sealed pursuant to Section 781.
Ca. Welf. and Inst. Code § 707.4