N.H. Rev. Stat. Ann. § 143:5

In the event that a person infected with any communicable disease is employed, or if structural alterations are necessary for the protection of food products as herein required, the commissioner of the department of health and human services shall issue an order prohibiting the employment of such person, or requiring such structural changes as in the opinion of the commissioner are necessary. Such order shall be transmitted by registered mail, and the receipt of the post office department therefor shall be prima facie evidence of its receipt by the person affected.