Conn. Gen. Stat. § 10-91j

(b) On and after July 1, 2019, a local or regional board of education shall not be eligible for reimbursement pursuant to subsection (b) of section 10-76g for any costs of special education paid by such board of education to a private provider of special education services unless such board of education has entered into a written contract with such private provider of special education services for the provision of such special education services. The individualized education program of a child shall not be considered a contract between a local or regional board of education and a private provider of special education services for purposes of this section. Nothing in this subsection shall be construed to limit or interrupt the provision of special education and related services to a child by a local or regional board of education or private provider of special education services.