Restrict Unescorted Access
Physical and Environmental Protection
NIST Control Text
Restrict unescorted access to the facility where the system resides to personnel with [Selection (one or more): security clearances for all information contained within the system; formal access authorizations for all information contained within the system; need for access to all information contained within the system; [Assignment: organization-defined physical access authorizations]].
NIST Discussion
Individuals without required security clearances, access approvals, or need to know are escorted by individuals with appropriate physical access authorizations to ensure that information is not exposed or otherwise compromised.
Parameter Values
Selection: Security clearances (SenL-5 Custodial clearance) [26]
SL5 Supplemental Guidance
Only personnel with SenL-5 (Custodial) clearance may enter Red Zones unescorted, and two authorized individuals must be present at all times (two-person integrity). Anyone without SenL-5—including SenL-4 holders and vendors—requires continuous escort by a SenL-5 holder, with all activities logged [26].