[Code of Federal Regulations] [Title 45, Volume 3] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 45CFR620.425] [Page 171] TITLE 45--PUBLIC WELFARE CHAPTER VI--NATIONAL SCIENCE FOUNDATION PART 620_GOVERNMENTWIDE DEBARMENT AND SUSPENSION (NONPROCUREMENT) --Table of Contents Subpart D_Responsibilities of National Science Foundation Officials Regarding Transactions Sec. 620.425 When do I check to see if a person is excluded or disqualified? As an agency official, you must check to see if a person is excluded or disqualified before you-- (a) Enter into a primary tier covered transaction; (b) Approve a principal in a primary tier covered transaction; (c) Approve a lower tier participant if agency approval of the lower tier participant is required; or (d) Approve a principal in connection with a lower tier transaction if agency approval of the principal is required.