Cal. Welf. and Inst. Code § 650 : CALIFORNIA WELFARE AND INSTITUTIONS CODE — CHILDREN — DELINQUENTS AND WARDS OF THE JUVENILE COURT — JUVENILE COURT LAW — WARDS-COMMENCEMENT OF PROCEEDINGS — Petition filed commencing proceedings
(a) Juvenile court proceedings to declare a minor a ward of the court pursuant to Section
601 are commenced by the filing of a petition by the probation officer except as specified in subdivision (b).
(b) Juvenile court proceedings to declare a minor a ward of the court pursuant to subdivision (e) of Section
601.3 may be commenced by the filing of a petition by the probation officer or the district attorney after consultation with the probation officer.
(c) Juvenile court proceedings to declare a minor a ward of the court pursuant to Section
602 are commenced by the filing of a petition by the prosecuting attorney.