Cal. WIC § 630

(a) If the probation officer determines that the minor shall be retained in custody, he or she shall immediately proceed in accordance with Article 16 (commencing with Section 650) to cause the filing of a petition pursuant to Section 656 with the clerk of the juvenile court who shall set the matter for hearing on the detention calendar. Immediately upon filing the petition with the clerk of the juvenile court, if the minor is alleged to be a person described in Section 601 or 602, the probation officer or the prosecuting attorney shall serve the minor with a copy of the petition and notify him or her of the time and place of the detention hearing. The probation officer or the prosecuting attorney shall notify each parent or each guardian of the minor of the time and place of the hearing if the whereabouts of each parent or guardian can be ascertained by due diligence. Notice pursuant to this subdivision may be given orally and shall not be delivered electronically.

(b) In a hearing conducted pursuant to this section, the minor has a privilege against self-incrimination and has a right to confrontation by, and cross-examination of, any person examined by the court as provided in Section 635.