Mo. Rev. Stat. § 162.945
The responsible local school district, the responsible special school district, or the state department of elementary and secondary education shall notify in writing by first class mail to the last known address or by personal service every parent or guardian of every child diagnosed, evaluated, reevaluated or assigned under the provisions of sections 162.670 to 162.995 of the results of any diagnosis, evaluation or reevaluation made pursuant to the terms of sections 162.670 to 162.995 and of the recommended assignment, change in assignment, or denial of assignment of the child to a class or program provided under sections 162.670 to 162.995. The notice shall advise the parent or guardian that, upon request, the parent or guardian shall be permitted to inspect, at the school attended by the child or at another convenient place at any time during regular school hours, all records pertaining to said child including all diagnoses, evaluations and reevaluations obtained by the responsible school district or the state department of elementary and secondary education. The notice shall also contain information as to the procedure for requesting a review of any action taken by the local school district or special district or the state department of elementary and secondary education.
§ 162.945, RSMo