N.C. Gen. Stat. § 106-245.16

The Board of Agriculture shall establish and promulgate such standards of quality, grades and weight classes for eggs sold or offered for sale in this State as will protect the consumer and the institutional consumer from eggs which are injurious or likely to be injurious to health by reason of the condition of the shell, or contents thereof, or by reason of the manner in which eggs are processed, handled, shipped, stored, displayed, sold or offered for sale. Such standards of quality, grades and weight classes as are promulgated and established by the Board shall also promote honesty and fair dealings in the poultry industry. Such standards, grades and weight classes may be modified or altered by the Board whenever it deems it necessary.