that may be created that a terrorist may see as an opportunity to try to exploit that vulnerability because, again, somebody's distracted or tsa's short staffed or any number of variations or scenarios that could be envisioned to say that this may be an opportunity for a terrorist to try exploit that real or perceived vulnerability. >> the fear is this could be some kind of blinking light for would-be evil doers? >> well, there's any number of poblts possibilities. you don't want to look at a worst case scenario but that's why tsa was created in wake of 9/11 is to address those highest risk possibilities and to say how can we mitigate or buy down risk by using a risk-based approach and try to make sure that, for example, the underwear bombers from christmas day 2009 using that nonmetallic improvis