During an audit, a manufacturing company wants to ensure employees do not bring unauthorized metal tools or weapons into a restricted clean room that houses sensitive test equipment. The security team must select a control that passively scans individuals as they walk through a doorway and alerts guards when concealed metallic objects are detected. Which physical access security measure best meets this requirement?
Magnetometers (walk-through metal detectors) create an electromagnetic field and alarm when that field is disturbed by ferromagnetic objects such as tools, knives, or firearms. They are specifically designed to find hidden metal on people entering a secure area. Fingerprint scanners, smart-card badge readers, and bollards each serve other purposes-verifying identity, checking credentials, or blocking vehicle impact-and do not detect concealed metal items.
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