15 CFR §2012.3

1. (a)Beef may only be entered as a product of a participating country if the importer makes a declaration to the Customs Service, in the form and manner determined by the Customs Service, that a valid export certificate is in effect with respect to the beef.
2. (b)To be valid, an export certificate shall:
   1. (1)Be issued by or under the supervision of the government of the participating country;
   2. (2)Specify the name of the exporter, the product description and quantity, and the calendar year for which the export certificate is in effect;
   3. (3)Be distinct and uniquely identifiable; and
   4. (4)Be used in the calendar year for which it is in effect.