21 U.S.C. § 952: Importation of controlled substances

such amounts of crude opium, poppy straw, concentrate of poppy straw, and coca leaves, and of ephedrine, pseudoephedrine, and phenylpropanolamine, as the Attorney General finds to be necessary to provide for medical, scientific, or other legitimate purposes, and during an emergency in which domestic supplies of such substance or drug are found by the Attorney General to be inadequate, in any case in which the Attorney General finds that competition among domestic manufacturers of the controlled substance is inadequate and will not be rendered adequate by the registration of additional manufacturers under section 823 of this title , or in any case in which the Attorney General finds that such controlled substance is in limited quantities exclusively for scientific, analytical, or research uses, is imported for medical, scientific, or other legitimate uses, and is imported pursuant to such notification, or declaration, or in the case of any nonnarcotic controlled substance in schedule III, such import permit, notification, or declaration, as the Attorney General may by regulation prescribe, except that if a nonnarcotic controlled substance in schedule IV or V is also listed in schedule I or II of the Convention on Psychotropic Substances it shall be imported pursuant to such import permit requirements, prescribed by regulation of the Attorney General, as are required by the Convention. In addition to the amount of coca leaves authorized to be imported into the United States under subsection (a), the Attorney General may permit the importation of additional amounts of coca leaves. All cocaine and ecgonine (and all salts, derivatives, and preparations from which cocaine or ecgonine may be synthesized or made) contained in such additional amounts of coca leaves imported under this subsection shall be destroyed under the supervision of an authorized representative of the Attorney General. With respect to a registrant under section 958 of this title who is authorized under subsection (a)(1) to import ephedrine, pseudoephedrine, or phenylpropanolamine, at any time during the year the registrant may apply for an increase in the amount of such chemical that the registrant is authorized to import, and the Attorney General may approve the application if the Attorney General determines that the approval is necessary to provide for medical, scientific, or other legitimate purposes regarding the chemical. Not later than 60 days after receiving the application, the Attorney General shall approve or deny the application. In approving the application, the Attorney General shall specify the period of time for which the approval is in effect, or shall provide that the approval is effective until the registrant involved is notified in writing by the Attorney General that the approval is terminated. If the Attorney General does not approve or deny the application before the expiration of the 60-day period under subparagraph (A), the application is deemed to be approved, and such approval remains in effect until the Attorney General notifies the registrant in writing that the approval is terminated. Each reference in this section to ephedrine, pseudoephedrine, or phenylpropanolamine includes each of the salts, optical isomers, and salts of optical isomers of such chemical.