Identify the physical security guideline that an incident responder should follow while eradicating insider threats in an organization.

Implementing a clean desk policy both digitally and physically is a critical physical security guideline for incident responders addressing insider threats. This policy ensures that sensitive information is not left exposed on desks or in open areas where unauthorized individuals might access it. A clean desk policy minimizes the risk of sensitive documents being viewed, stolen, or misplaced and reinforces the culture of security within the organization.

Moreover, it encourages employees to securely store sensitive materials, both in physical and digital formats. This practice not only helps in safeguarding sensitive information but also aids in maintaining a disciplined approach towards data handling among employees. By establishing this guideline, an organization creates an environment where individuals remain vigilant about protecting sensitive data, thus helping to mitigate risks posed by insider threats.