233.11  Contact with publishers, manufacturers, or their representatives prohibited.--It is unlawful for any member of a state instructional materials committee to discuss matters relating to instructional materials submitted for adoption with any agent of a publisher or manufacturer of instructional materials, either directly or indirectly, except during the period when the committee shall have been called into session for the purpose of evaluating instructional materials submitted for adoption. Such discussions shall be limited to official meetings of the committee and in accordance with procedures prescribed by the Commissioner of Education for that purpose.