In the field of biological weapons, there is almost no prospect of detecting a pathogen until it has been used in an attack.

We have no such weapons at all, no chemical weapons, no biological weapons.

The U.N. Security Council ordered Iraq in April 1991 to relinquish all capabilities to make biological, chemical and nuclear weapons as well as long-range missiles.

One letter to bin Laden reveals that al Qaeda was working on chemical and biological weapons in Iran.

When we're talking about technology that involves weapons of mass destruction, nuclear, chemical or biological weapons, there has to be an element of preemption.

Governors normally have jurisdiction over public health emergencies, but a widespread biological attack would cross state boundaries.