By Tina Won Sherman
Why GAO Did This Study The Threat Screening Center, administered by FBI, is responsible for managing the terrorist watchlist. In recent years, Members of Congress have raised questions about how nonfederal entities use the terrorist watchlist. GAO was asked to examine the use of the terrorist watchlist by nonfederal law enforcement entities. This report examines (1) nonfederal entities’ reporting of terrorist watchlist encounters to FBI and opportunities for improvement and (2) steps FBI has taken to ensure nonfederal entities’ awareness of watchlist policies through outreach and state-led trainings. GAO reviewed watchlist policies and training resources for nonfederal entities and collected encounter data for fiscal years 2019 through 2024. GAO interviewed nonfederal law enforcement officials in four states selected based on the number of encounters and other factors. While not generalizable, these interviews provided insights into officials’ awareness of policies and training. This is the public version of a sensitive report GAO issued in August 2025. Information on encounter data and official FBI instructions on handling watchlist encounters that FBI deemed sensitive has been omitted.What GAO Recommends GAO recommends that FBI (1) seek information to understand the extent to which nonfederal law enforcement entities are consistently reporting terrorist watchlist encounters, (2) develop a communication plan to improve its outreach efforts, and (3) develop a process to review state efforts to instruct NCIC users about watchlist policies. FBI concurred with the recommendations.