Common weakness in physical security plans?

A common weakness in physical security plans is the Lack of trained personnel. Even with advanced technology like metal detectors and CCTV, human error or insufficient training can compromise security effectiveness. Personnel must be proficient in operating equipment, recognizing threats, and following protocols.

• Use of metal detectors is a security measure, not an inherent weakness, if properly implemented.
• Over-reliance on CCTV can be a weakness if not monitored effectively, but the lack of trained personnel is a more fundamental flaw.
• Therefore, 'None of these' is incorrect as untrained personnel significantly weaken security.