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"It's not the bullet that's got my name on it that concerns me; it's all them other ones flyin' around marked 'To Whom It May Concern.'"

I suspect they've become a bit more sophisticated as they've grown, especially when it comes to being more than just a 'tourist'. They'll certainly have a counter-intelligence system in place.

For IS, in Syria, I doubt they care too much about whether their information held compromise Jihadists when they return to their home nations. They'll probably select people for 'work abroad' from a different recruiting approach. However they'll be very concerned regarding infiltration.

Traditionally, Islamist groups tend to see Jihadists as 'disposable' and 'Public Relations' rather than reliable front line troops. Most of those turning up won't have any really useful training or experience, and be more ideologically inspired, than practical, which at least means they make reasonable suicide bombers.

The Afghan Mujahadeen generally regarded foreign fighters as something of a mixed blessing, and unreliable, disruptive and in need of a lot of training. So they tended to stick them in their own groups if they didn't have useful skills (Bin Laden being an engineer, was very useful - some 20 year old kid who's only worked in Chicken Shack, less so).

Plus they tended to get in the way a lot because they were undisciplined, ideologically motivated, unpractical and rarely spoke useful languages.

Over time, many of those who lasted, prospered, and became increasingly useful. But a lot were really just given positions and jobs because they brought in money from the arab world.

An exception would be those who were experienced Jihadists, or had military experience (or other useful skills). But largely the rest were considered 'more trouble than use'.

"One Nation Under God, has turned into One Nation Under the Influence of One Drug"
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