21 C.F.R. § 1312.14
The Administration shall transmit the import permit to the competent national authority of the exporting country and shall make an official record of the import permit available to the importer through secure electronic means. The importer, or their agent, must submit an official record of the import permit 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 maintain an official record of the import permit (available from the DEA Diversion Control Division secure network application after issuance) in accordance with part 1304 of this chapter as the record of authority for the importation and shall transmit an official record of the permit to the foreign exporter. If required by the foreign competent national authority, the importer shall ensure that an official record of the import permit is provided (e.g., by transmitting an official record of the permit to the foreign exporter who shall transmit such record to the competent national authority of the exporting county). The importer must ensure that an official record of the permit accompanies the shipment of controlled substances to its final destination, the registered location of the importer (i.e., drop shipments are prohibited).
21 C.F.R. §1312.14