It does not work that way.
When the BP rounds up a group of 20 illegals, they don't have time to interrogate each and everyone. It's fingerprints, photos and back to Mexico. Now they just gave that Al Quada operative another shot at getting in.
On the same token, how do they tell the mass murderer from the farmer. The serial bomber from the produce picker.
Does the name Rameriz mean anything.