Me. Rev. Stat. tit. 20-A, § 5803

A school administrative unit which receives tuition students shall give at least 2 years' notice to a sending school administrative unit before discontinuing the acceptance of tuition students. The receiving unit shall file a copy of the notice with the commissioner. If the school board of a receiving unit fails to give a proper 2-year notice, the commissioner may take enforcement action as authorized by section 6801‑A.