A. Notwithstanding section 11-291:
1. A county that has a population of less than six hundred thousand persons must provide the benefit levels and categories of services for the behavioral health treatment, behavioral health hospitalization and behavioral health medical care of persons who are seriously mentally ill as required by law as of January 1, 2001.
2. A county that has a population of more than six hundred thousand persons but less than two million persons and that has an intergovernmental agreement with the department of health services in effect as of January 1, 2001 for the delivery of behavioral health and mental health care services must maintain an agreement with this state to provide for the integration of the system at the same funding amount, except for the funding for court-ordered screening and evaluation pursuant to title 36, chapter 5, article 4.
3. A county that has a population of more than two million persons and that has an intergovernmental agreement with the department of health services in effect as of January 1, 2001 for the delivery of services to the seriously mentally ill must maintain an agreement with this state to provide for the integration of the system at the same terms and funding amount and with a mutually agreed on annual adjustment for inflation.
B. For the purposes of this section, "seriously mentally ill" has the same meaning prescribed in section 36-550.