Why have many of the most damaging spies held a high-level security clearance?
While there may have been no justification for denying a clearance to these individuals at the time of their initial selection for a position of trust, people change over time. Issues develop—sometimes years later—that render a person vulnerable to compromise or impel that person to engage in illegal behavior. A major challenge for personnel security programs is to identify and address potential issues and vulnerabilities of members of the current workforce before they get out of control.
