Records; subject to examination

(a) For the enforcement of this chapter, the following classes of persons shall keep records as the board may prescribe and all persons subject to the requirements shall, at all reasonable times, upon notice by a duly authorized representative of the board, afford the representative or any duly authorized representative of the Secretary of Agriculture access to their places of business and opportunity to examine the facilities, inventory, and records thereof, to copy all of those records, and to take reasonable samples of their inventory upon payment of the fair market value therefor: (1) Any person who engages, in or for intrastate commerce, in the business of slaughtering any cattle, sheep, swine, goats, horses, mules, or other equines, or preparing, freezing, packaging, or labeling any carcasses, or parts or products of carcasses, of any animals, for use as human food or animal food. (2) Any person who engages in the business of buying or selling as meat broker, wholesaler or otherwise, or transporting in intrastate commerce, or storing in or for commerce, any carcasses, or parts or products of carcasses, of any animals. (3) Any person who engages in business, in or for intrastate commerce, as a renderer, or engages in the business of buying, selling, or transporting, in commerce, any dead, dying, disabled, or diseased cattle, sheep, swine, goats, horses, mules, or other equines, or parts of the carcasses of the animals that died otherwise than by slaughter. (4) Any person who engages in the business of custom slaughtering or preparing any cattle, sheep, swine, goats, horses, or other equines for use as human food or animal food. (b) Any record required to be maintained by this section shall be maintained for the period of time as the board may prescribe.