“As U.S.-backed forces made their final push into the city of Raqqa to liberate what had once been the Syrian capital of the Islamic State’s self-declared caliphate, they faced a problem. Not only were the Syrian Democratic Forces (SDF) holding IS fighters — some captured and some who had surrendered — they were also encountering many Syrians who, for various reasons, had collaborated with or worked for the terror group.”
Source: Scrambling to Track Islamic State Terrorists, Coalition Turns to Biometrics