Cal. Welf. & Inst. Code § 5344

Any expenditure for the custody, evaluation, treatment, or other procedures for services rendered a person pursuant to this article shall be considered an expenditure made under the provisions of Part 2 (commencing with Section 5600) of this division, and shall be paid as are other expenditures pursuant to that part. No person shall be admitted to a state hospital for care and treatment of his or her use of controlled substances prior to screening and referral by an agency designated in the county Short-Doyle plan to provide the services.