The Committee shall designate by regulation a schedule, hereinafter referred to as the procurement schedule, of the products directly manufactured, produced, processed or assembled or services directly performed, offered or provided by any severely disabled person or qualified nonprofit agency for the severely disabled, as defined by this act, which the Committee determines are suitable for procurement by the state. No state agency shall purchase, pursuant to Section 3007 of this title, products or services purporting to be made by severely disabled persons in workshops which are not certified by the Committee or by severely disabled individuals who are not certified by the Committee.