Within DHS, TSA is the federal agency with primary responsibility for preventing and defending against terrorist and other threats to domestic transportation systems. From fiscal years 2002 through August 2015, TSA obligated $13.4 billion to acquire security-related technologies such as through the Electronic Baggage Screening Program and the Passenger Screening Program. However, GAO and the DHS Office of Inspector General have reported that TSA did not fully follow DHS policies in deploying Advanced Imaging Technology systems to screen passengers and in estimating costs to screen checked baggage, and faced challenges in managing inventory. Enacted in December 2014, TSARA specifies measures that TSA must take to improve transparency and accountability in acquiring security-related technologies. TSARA contains a provision that GAO report to Congress on TSA's progress in implementing TSARA. This report examines TSA's actions taken toward addressing TSARA. GAO is not fully evaluating the extent to which TSA is implementing the act at this time because TSA has not undertaken an acquisition of security-related technology subject to the requirements of the act since its enactment. Pursuant to TSARA, GAO will report again on TSA's implementation of the act in approximately 3 years. TSA