21 U.S.C. § 1905 — Authorities

(a) General rule To carry out the purposes of this chapter, the Secretary of the Treasury can, under these regulations as he may prescribe, by means of instructions, licenses, or otherwise— (1) investigate, regulate, or prohibit— (A) any transactions in foreign exchange, currency, or securities; and (B) transfers of credit or payments between, by, through, or to any banking institution, to the extent that such transfers or payments involve any interests of any foreign country or a national of it; and (2) investigate, block during the pendency of an investigation, regulate, direct and compel, nullify, void, prevent, or prohibit any acquisition, holding, withholding, use, transfer, withdrawal, transportation, placement into foreign or domestic commerce of, or dealing in, or exercising any right, power, or privilege with respect to, or transactions involving, any property in which any foreign country or a national of it has any interest, by any person^*, or with respect to any property, subject to the jurisdiction of the United States. (b) Recordkeeping Pursuant to subsection (a), the Secretary of the Treasury may require recordkeeping, reporting, and production of documents to carry out the purposes of this chapter. (c) Defenses (1) Full and actual compliance with any regulation, order, license, instruction, or direction issued under this chapter must be a defense in any proceeding alleging a violation of any of the rules in this chapter. (2) No person must be held liable in any court for or with respect to anything done or omitted in good faith in connection with the administration of, or under, and in reliance on this chapter, or any regulation, instruction, or direction issued under this chapter. (d) Rulemaking The Secretary of the Treasury may issue such other regulations or orders, including regulations prescribing recordkeeping, reporting, and production of documents, definitions, licenses, instructions, or directions, as can be necessary for the exercise of the authorities granted by this chapter.