Which of the following statements about PSIs is true?

In the context of personnel security investigations (PSIs), the statement that PSIs may include inquiries to law enforcement is true. PSIs are comprehensive assessments conducted to evaluate the trustworthiness and reliability of individuals seeking access to sensitive information or positions of trust. These investigations can involve various sources and methods to gather information about the individual's background and behaviors.

Inquiries to law enforcement agencies are an essential part of this process because they help verify an individual's criminal history, if any, and assess any potential risks associated with their past behavior. Such inquiries can provide critical insights, particularly in determining suitability for positions that require high levels of security clearance or trust.

Other options do not accurately reflect the full scope and requirements of PSIs. For instance, while interviews with references can be a component of a PSI, they are not the sole focus, and PSIs encompass more than just financial history, as they evaluate various aspects of an individual's life, including personal conduct, character references, and employment history. Furthermore, PSIs are generally mandatory for federal employees in positions that require security clearance, emphasizing the importance of thorough background checks in maintaining national security.