Closing the site
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
As determined by the Director (Director, NIST Boulder Laboratories, for sites in Colorado), the site may be closed to the public in emergency situations and at such other times as may be necessary for the orderly conduct of the Government's business. At such times no person shall enter the site except authorized individuals, who may be required to sign a register and display identification when requested by a uniformed guard.
[39 FR 41170, Nov. 25, 1974, as amended at 56 FR 66969, Dec. 27, 1991]
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.