The Office of Inspection in the Transportation Security Administration (TSA) conducts inspections, internal reviews, and covert testing to ensure the effectiveness and efficiency of TSA's operations and administrative activities, and to identify vulnerabilities in TSA security systems. Additionally, the office carries out internal investigations of theTSA workforce to ensure its integrity. We conducted an audit of this office to determine whether it is efficient and effective in its efforts to enhance transportation security. The Office of Inspection did not operate efficiently. Specifically, the office did not use its staff and resources efficiently to conduct ost ‐ effective inspections, internal reviews, and covert testing. The office employed personnel classified as “criminal investigators,” even though their primary duties may not have been criminal investigations as required by Federal law and regulations.