7 U.S. Code § 1636d - Recordkeeping
(a) In generalSubject to subsection (b), each packer required to report information to the Secretary under this subchapter shall maintain, and make available to the Secretary on request, for 2 years—
the original contracts, agreements, receipts and other records associated with any transaction relating to the purchase, sale, pricing, transportation, delivery, weighing, slaughter, or carcass characteristics of all livestock; and
(b) LimitationsUnder subsection (a)(2), the Secretary may not require a packer to provide new or additional information if—
(c) Purchases of cattle or swineA record of a purchase of a lot of cattle or a lot of swine by a packer shall evidence whether the purchase occurred—
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