The long-term solution for captured ISIS members

And with the apparent re-emergence, via video, of ISIS leader Abu Bakr al-Baghdadi on Monday encouraging what remains of ISIS to continue, radical detainees represent an even greater risk. (The United States is working to confirm the authenticity of the video.)

The parched, forbidding sands of northeast Syria are home to detention camps, with one, al-Hol, holding more than 73,000 people, according to the Washington Post.