One can only hope that this isn't an isolated trend: "Europeans back plan to profile mosques."
This is like finding needles in a haystack, but only if one ignores that needles have a nature. Treating them like hay means failing to apply tools like metal detectors to the task.
One example [U.S. Homeland Security Secretary Michael Chertoff] cited is the case in June 2003 of an agent at Chicago's O'Hare airport who, unsatisfied with a foreign traveler's responses, refused entry and sent him back to where he had come from _ first taking his fingerprints.
Those fingerprints, according to Chertoff, turned up later on the steering wheel of a suicide truck bomb detonated in Iraq.
Better that he blow himself up over there than over here.