9 C.F.R. § 78.11
Cattle, except brucellosis reactors and brucellosis exposed cattle, which are moved interstate to a specifically approved stockyard but fail to comply with the requirements of this part for release from the specifically approved stockyard may be moved from the specifically approved stockyard only as follows:
(c) Directly to a recognized slaughtering establishment if such cattle are
(2) Accompanied by an “S” brand permit and moved in vehicles closed with official seals applied and removed by an APHIS representative, State representative, an accredited veterinarian, or an individual authorized for this purpose by an APHIS representative.
The official seal numbers must be recorded on the “S” brand permit; or
(d) Directly to a quarantined feedlot if such cattle are “S” branded and accompanied by an “S” brand permit.
(Approved by the Office of Management and Budget under control number 0579-0047)
[51 FR 32580, Sept. 12, 1986, as amended at 56 FR 54534, Oct. 22, 1991; 56 FR 58638, 58639, Nov. 21, 1991]