20 U.S. Code § 4706 - Scholarship conditions
(a) In general
A person awarded a scholarship under this chapter may receive payments authorized under this chapter only during such periods as the Foundation finds that the person is maintaining satisfactory proficiency and devoting full time to study or research and is not engaging in gainful employment other than employment approved by the Foundation pursuant to regulations of the Board.
The Foundation may require reports containing such information in such form and to be filed at such times as the Foundation determines to be necessary from any person awarded a scholarship under this chapter. Such reports shall be accompanied by a certificate from an appropriate official at the institution of higher education, approved by the Foundation, stating that such person is making satisfactory progress in, and is devoting essentially full time to study or research, except as otherwise provided in subsection (a) of this section.