Round-Trip Tickets: How Will Authorities Know When Foreign Fighters Have Returned?

Now that the Islamic State’s caliphate is collapsing in Iraq and Syria, Europe is bracing for an influx of foreign fighters attempting to return home to their respective countries of origin. Many of the Islamic State’s European cadres have a criminal past, and tracking and arresting them in the criminal underworld will be vital for preventing potential attacks and longer-term counterterrorism success.

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