Which type of PSI is no longer used to determine access eligibility to classified information?

The type of Personnel Security Investigation (PSI) that is no longer used to determine access eligibility to classified information is the National Agency Check. This investigation was primarily focused on checking federal records but lacked the comprehensive scope and depth needed to properly assess individuals for access to classified information in today's security environment.

The shift away from the National Agency Check reflects a broader understanding that merely checking federal records is insufficient for national security determinations. In comparison, the other options, such as the Access National Agency Check and the National Agency Check with Local Agency and Credit Checks, and especially the Single Scope Background Investigation, provide a more thorough review. These newer investigations include an examination of an individual's entire background, including personal history, local records, and credit checks, ensuring a more holistic and rigorous evaluation of an individual's suitability for access to classified information.