Personnel security involves managing the risks of employees exploiting their access to an organization's assets or premises for unauthorized purposes. It is important to maintain personnel security throughout employment through pre-employment screening, effective management, clear communication, and building a strong security culture. Personnel security also includes managing employees leaving the organization. When applied consistently, personnel security reduces vulnerabilities and helps build a beneficial security culture. It aims to employ reliable staff, minimize risks of employees becoming unreliable, and detect and address suspicious behavior. Personnel security risk assessments focus on individuals, their access, potential risks, and adequacy of countermeasures to inform security practices.