21 C.F.R. § 1312.19
The importer must furnish an official record of the declaration (available through the DEA Diversion Control Division secure network application after the Administration issues a transaction identification number) to the foreign shipper. The foreign shipper must submit an official record of the declaration to the competent national authority of the exporting country, if required as a prerequisite to export authorization. The importer, or their agent, must submit an official record of the declaration and/or required data concerning the import transaction to a customs officer at the port of entry in compliance with all import control requirements of agencies with import control authorities under the Act or statutory authority other than the Controlled Substances Import and Export Act. The importer must ensure that an official record of the declaration accompanies the shipment to its final destination, which must only be the registered location of the importer (i.e., drop shipments are prohibited). The importer must maintain an official record of the declaration in accordance with part 1304 of this chapter.
21 C.F.R. §1312.19