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]