They are needles in a haystack. Very hard to find.
Fridays they are at the mosque..... the rest of the week at the local strip club.
Burn the haystack: Sweep and deport all illegal moslems. Deport all visa holders and naturalized moslems that committed visa fraud by lying about associations with radical groups. Keep only the most loyal and trustworthy. THEN the needle is much easier to find.
"They are needles in a haystack."
Maybe one should use a magnet and start profiling?