21 U.S. Code § 1905 - Authorities
(a) In general
To carry out the purposes of this chapter, the Secretary of the Treasury may, under such regulations as he may prescribe, by means of instructions, licenses, or otherwise—
(1) investigate, regulate, or prohibit—
(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 thereof has any interest,
by any person, or with respect to any property, subject to the jurisdiction of the United States.
Pursuant to subsection (a) of this section, the Secretary of the Treasury may require recordkeeping, reporting, and production of documents to carry out the purposes of this chapter.
(1) Full and actual compliance with any regulation, order, license, instruction, or direction issued under this chapter shall be a defense in any proceeding alleging a violation of any of the provisions of this chapter.
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 may be necessary for the exercise of the authorities granted by this chapter.