Can one-time access be granted for certain classified information without a full PSI?

The assertion that one-time access cannot be granted for certain classified information without a full Personnel Security Investigation (PSI) is rooted in the fundamental principles of personnel security and access control within classified environments. The rationale behind requiring a full PSI is to ensure that individuals who are granted access to classified information meet the necessary security standards, which include a thorough evaluation of their trustworthiness, reliability, and loyalty to the United States.

One-time access to classified information without a full PSI is not permissible because it compromises the integrity of the security clearance process. This process is designed to prevent unauthorized access and ensure that individuals interacting with sensitive information have been scrutinized through a comprehensive background check. Granting access without this level of vetting could lead to security breaches, exposing classified information to potential risks.

While certain exceptions, such as temporary access in emergency situations or for specific operational needs, may exist in some circumstances, these do not apply across the board and would still require adherence to strict guidelines and oversight. Thus, the requirement for a full PSI remains a critical safeguard in protecting national security interests.