(a) Except as provided by subsection (b), on and after January 1, 2021, no municipality shall file or become a party to opioid litigation in any court without the prior approval of the attorney general. Any municipality that filed or became a party to opioid litigation on or after January 1, 2021, through the effective date of the Kansas fights addiction act shall withdraw from such opioid litigation, unless such municipality receives approval from the attorney general to maintain such opioid litigation.

(b) This section shall not apply to or affect any municipality that filed or became a party to opioid litigation in court prior to January 1, 2021.