The Islamic State, or ISIS, made global headlines recently on account of two significant developments in Syria: a prison uprising in Hasakeh in late January and the raid by U.S. special operations forces a week later, on Feb. 3, that resulted in the death of ISIS leader Abu Ibrahim al-Hashimi al-Qurashi.
Both events have focused attention on the Islamic State’s capacity to wage insurgency and mobilize militants in its former territory. But another factor that is potentially more important in assessing the group’s future prospects is the large number of ISIS members and sympathizers languishing in detention nearly four years after the group’s territorial defeat