Security-in-depth
Security-in-depth means a determination by the agency head that a facility's security program consists of layered and complementary security controls sufficient to deter and detect unauthorized entry and movement within the facility. Examples include, but are not limited to, use of perimeter fences, employee and visitor access controls, use of an Intrusion Detection System (IDS), random guard patrols throughout the facility during nonworking hours, closed circuit video monitoring or other safeguards that mitigate the vulnerability of open storage areas without alarms and security storage cabinets during nonworking hours.