Transportation Security: TSA Has Taken Steps to Improve Security Areas Identified in the TSA Modernization Act, but Additional Actions Are Needed, Statement of William Russell, Director, Homeland Security and Justice, Testimony Before the Subcommittee on Transportation and Maritime Security, Committee on Homeland Security, House of Representatives [open pdf - 193KB]
From the Highlights: "Threats to the nation's transportation systems persist and continue to evolve. Within DHS, TSA is the federal agency with primary responsibility for the prevention of and defense against terrorist and other threats to the United States' civil aviation, and rail, public transit, pipeline, and other surface transportation systems. The TSA Modernization Act includes provisions intended to enhance security across this broad range of systems and further calls on GAO [Government Accountability Office] to review TSA's progress in these areas. This statement summarizes past and ongoing work related to TSA's actions to address selected aviation and surface transportation security areas covered by the TSA Modernization Act. This statement is based on products GAO issued from December 2017 through October 2019 and draft reports currently with TSA for comment."
Government Accountability Office: https://www.gao.gov/