(a)
If the court has determined that a minor is a person described by Section 602, or if the court has determined that a minor is a person described by Section 601 and a supplemental petition for commitment of such minor to the Youth Authority has been filed pursuant to Section 777, and such minor is otherwise eligible for commitment to the Youth Authority, the court, if it concludes that a disposition of the case in the best interest of the minor requires such observation and diagnosis as can be made at a diagnostic and treatment center of the Youth Authority, may continue the hearing and order that such minor be placed temporarily in such a center for a
period not to exceed 90 days, with the further provision in such order that the Director of the Youth Authority report to the court its diagnosis and recommendations concerning the minor within the 90-day period.
(b)
The Director of Youth Authority shall, within the 90 days, cause the minor to be observed and examined and shall forward to the court his diagnosis and recommendation concerning such minor’s future care, supervision, and treatment.
(c)
The Youth Authority shall accept such person if there is in effect a contract made pursuant to Section 1752.1 and if it believes that the person can be materially benefited by such diagnostic and treatment services, and if the Director of the Youth Authority certifies that staff and institutions are available. No such person shall be transported to any facility under the jurisdiction of the Youth Authority until the director has
notified the referring court of the place to which said person is to be transported and the time at which he can be received.
(d)
The probation officer of the county in which an order is made placing a minor in a diagnostic and treatment center pursuant to this section, or any other peace officer designated by the court, shall execute the order placing such minor in the center or returning him therefrom to the court. The expense of such probation officer or other peace officer incurred in executing such order is a charge upon the county in which the court is situated.