The American government has a system being put into place to detect domestic nuclear blasts. It's part of an effort to guard against potential attacks.

The idea is to prevent a nuclear attack before it happens.

Teams of scientists with hidden radiation detectors went out to check some major American cities for signs that terrorist might be trying to us radiological weapons. Up until about 10 years ago this was all top secret.

Most experts say that the risk of a nuclear attack is low but not unthinkable, because of the spread of nuclear materials around the world.

Scientists can analyze tiny bits of radioactive fallout that is invisible to the naked eye. It can reveal distinctive strains that describe the type of bomb, where it was manufactured and the country it came from.

A nuclear blast leaves clues that can help track down the specific terrorist groups.

[If a nuclear bomb blows up and kills everyone and everything in sight for miles, and can wipe out a country, what is left to find and who to find it?]

The idea of this scientific art is to let terrorists know that America will find the smoking gun and track them down. [oooh, I bet that scares them!]

The government believes that if terrorists know they can be traced quickly, then they will be less likely to use a nuclear weapon.

[they don't care...dying as martyrs is their goal....that's why they are suicide bombers. duh!!!]

Scientists will be able to figure out very quickly what group may be responsible for detonating a nuclear bomb by tracing its source of material.

[Like they can do a whole lot after all the harm and damaged has been done!]

A New York Times article, quote: "to cope with the possibility that terrorists might someday detonate a nuclear bomb on American soil, the federal government is reviving a scientific art that was lost after the cold war."