They're the Insane Clown Posse, and the only question is whether there's ever been a governmental agency that spent more money ($40 Billion since 2002) for less result (zero terrorists caught).
The interesting question is why the public puts up with it. ASM826 offers an elegant answer. As the techies would say, it's np complete.
As they say up in New England, that guy is one wicked smaht bahstahd.