June 26, 2000
The post-employment restrictions of 18 U.S.C. § 207(c) apply to persons who are assigned from a university or a state or local government to the Department of Energy under the Intergovernmental Personnel Act and are compensated at or above the ES-5 level, except for those who occupy positions ordinarily below the ES-5 level and who receive salaries only from the detailing employers, with the federal agency reimbursing those employers for an amount less than an ES-5 salary.
https://www.justice.gov/file/19396/download