Under existing law, a minor who is 12 to 17 years of age when they violate any criminal law in this state, except an ordinance establishing a curfew based solely on age, or a minor under 12 years of age if they commit certain serious offenses, is within the jurisdiction of the juvenile court, which may adjudge the person a ward of the court. Existing law requires, after finding that the minor is within the jurisdiction of the juvenile court, the court to hear evidence on the question of the proper disposition to be made of the minor and requires the court to receive in evidence a social study of the minor made by the probation officer. Existing law requires, when the probation officer recommends the minor to be placed in foster care, or if the minor is already in foster care placement or pending placement pursuant to an earlier order, the social study to include a case plan with specified components.