The Secretary may provide such reasonable limitations and may make such rules and regulations allowing reasonable variations, tolerances, and exemptions to and from any or all provisions of this subchapter as he may find necessary and proper in the public interest to prevent injustice or undue hardship or to avoid serious impairment of the conduct of Government business.
(Pub. L. 87–581, title I, §105, Aug. 13, 1962, 76 Stat. 359.)