Existing law authorizes a court to order a ward who is 14 years of age or older to be committed to a secure youth treatment facility, operated by the county of commitment, for a period of confinement if the ward is adjudicated and found to be a ward based on the commitment of a specified serious offense committed when the juvenile was 14 years of age or older, that adjudication is the most recent offense for which the ward has been adjudicated, and the court has made a finding on the record that a less restrictive, alternative disposition for the ward is unsuitable. Existing law creates various rules for the period of confinement of the juvenile.