Cal. Welf. and Inst. Code § 780
If any person who has been committed to the Youth Authority appears to be an improper person to be received by or retained in any institution or facility under the jurisdiction of the Department of the Youth Authority or to be so incorrigible or so incapable of reformation under the discipline of any institution or facility under the jurisdiction of the department as to render his or her retention detrimental to the interests of the department, the department may order the return of that person to the committing court. However, the return of any person to the committing court does not relieve the department of any of its duties or responsibilities under the original commitment, and that commitment continues in full force and effect until it is vacated, modified, or set aside by order of the court.
If any person is returned to the committing court, his or her transportation shall be made, and the compensation therefor paid, as provided for the order of commitment.
Ca. Welf. and Inst. Code § 780