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As part of our layered approach, we have expedited the deployment of new Advanced Imaging Technology (AIT) units to help detect concealed metallic and non-metallic threats on passengers. These machines are now in use at airports nationwide, and the vast majority of travelers say they prefer this technology to alternative screening measures.

Would-be terrorists cannot so much as board a plane without a thorough screening, yet we give them nearly unfettered access to very dangerous weapons.

I've been focused on detecting nuclear terrorism at ports, in cargo containers, and I developed and built detectors that are extremely cheap and also very sensitive. My other big development is a system to produce medical isotopes that are injected into patients and used to diagnose and treat cancer.

Increased and better screening for explosives is necessary - and Congress should fund it and TSA should implement it as quickly as possible - however that screening doesn't reduce the risk posed by a trained terrorist with an unconventional weapon.

To my knowledge, the Department of Homeland Security has focused on detection devices that are large, expensive, use a large amount of energy, and cannot easily be placed in or on a shipping container.

Security is a component of everyday life that one spending time in Washington, D.C., gets accustomed to. Metal detectors, police vehicle barriers and heavily-armed police officers become strangely commonplace after awhile.

We need to put undercover security armed people at the curbside of the terminal with the uniform of policemen. We need to protect the terminal. We need to protect the security checkpoint, the gate, the aircraft, the perimeter.

We save limited resources in terms of who we are physically screening. The approach will allow us to pay more attention to those potential terrorists.

Airport security exists to guard us against terrorist attacks.

I developed a counterterrorism device that's revolutionizing the way we detect nuclear materials.