(a) The department may contract only with local mental health authorities and local behavioral health authorities to administer outreach, screening, assessment, and referral functions relating to the provision of substance abuse services. A local mental health authority or local behavioral health authority may subcontract with a substance abuse or behavioral health service provider to provide those services.
(b) A local mental health authority or local behavioral health authority who contracts with the department to administer outreach, screening, assessment, and referral functions relating to the provision of substance abuse services shall develop an integrated service delivery model that, to the extent feasible, uses providers who have historically administered outreach, screening, assessment, and referral functions.