Mass. Gen. Laws ch. 94 § 3
All bakery products and ingredients thereof shall be stored, handled, transported and kept so as to protect them from spoilage, contamination, disease and unwholesomeness. Boxes and other permanent receptacles or containers for the storing, receiving or handling of bakery products shall be so placed and constructed as to be beyond the reach of contamination from streets, alleys and sidewalks and from animals, and shall be kept clean and sanitary by the dealer. No other articles shall be placed therein in addition to said products. No person shall tamper with, injure or contaminate said boxes, receptacles or containers, nor shall any person other than the baker or dealer or his employees remove anything therefrom or place anything therein.
Mass. Gen. Laws ch. 94, § 3