ECIH v3 insider-threat handling emphasizes monitoring legitimate users for anomalous or policy-violating activities because insiders often already possess authorized access that allows them to bypass perimeter defenses. An employee monitoring tool can provide visibility into unusual file access, copying, transfers, application usage, removable-media activity, communications, and other digital behaviors associated with information theft. When deployed according to organizational policy and applicable privacy requirements, such monitoring can generate actionable alerts and support timely investigation. Changing office locations has little relationship to digital information leakage. Random polygraph testing is intrusive, unreliable as a continuous security control, and legally problematic in many environments. Bag checks address only physical removal of material and would not detect electronic exfiltration. Continuous, policy-based digital activity monitoring therefore provides the most effective control among the listed options.

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