All additional exemptions allowed under this subsection shall be granted provided that the food store or food department maintains an automated checkout system that has been determined to be at least 95 per cent accurate during a price accuracy inspection conducted by the division or a designee and maintains a dated, written price list of the items it has chosen to exempt. The price list shall include a clear description of each item and the code number understood by the seller's automated checkout system. Deletions may be made from the list at any time, but no additions, substitutions or changes may be made to the list except twice a year in January and July. The exemption permitted by this section shall not apply to any item not on that price list and shall not apply unless the price list has been established and is available upon request at the food store or food department to any consumer or any representative authorized by the deputy director. The list shall be maintained so that any item may be referenced easily by a consumer. No seller may choose to exempt items required to be price marked by other laws or regulations governing specific types of items, nor may a seller exempt more than 200 items in any 1 department except in the grocery department.
Mass. Gen. Laws ch. 94, § 184C