Catch and release!!!!! If this article is correct, why are Iranians being singled out for such special treatment? Aren't they considered foreign fighters like most of AQ in Iraq?
The term "catch and release" for terrorists actually originated with AQI. Once the facilitators caught on that we had to catch them with physical evidence, they'd avoid it like the plague. A low level VBIED mechanic caught with bombs in his garage would go to jail, while his boss would walk. All they have to do is both deny it. We've arrested some of the same leaders several times, and let them go due to lack of physical evidence. There's plenty of intelligence that shows them to be guilty, but nothing we'd allow in court.
Not detaining the Iranians, on the other hand, was a diplomatic courtesy, regardless of what physical evidence of terrorist ties they were caught with.
Roll that idea around in your head for a while.