A foster child who has become the subject of a legal guardianship, who is receiving assistance under the Kin-GAP Program under this article or under Article 4.7 (commencing with Section 11385), including Medi-Cal, and whose foster care court supervision has been terminated, shall be provided medically necessary specialty mental health services by the local mental health plan in the county of residence of his or her legal guardian, pursuant to all of the following:
(a) The host county mental health plan shall be responsible for submitting the treatment authorization request (TAR) to the mental health plan in the county of origin.
(b) The requesting public or private service provider shall prepare the TAR.
(c) The county of origin shall retain responsibility for authorization and reauthorization of services utilizing an expedited TAR process.