[Code of Federal Regulations] [Title 7, Volume 6] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 7CFR500.2] [Page 377] TITLE 7--AGRICULTURE CHAPTER V--AGRICULTURAL RESEARCH SERVICE, DEPARTMENT OF AGRICULTURE PART 500_NATIONAL ARBORETUM--Table of Contents Subpart A_Conduct on U.S. National Arboreturm Property Sec. 500.2 Recording presence. Admission to the USNA during periods when it is closed to the public will be limited to authorized individuals who may be required to sign the register or display identification documents when requested by the Security Staff, or other authorized individuals.