Bruce Schneier: …I want to assume the TSA is both intelligent and motivated to protect us. I'm taking your word for it that there is an actual threat—lots of chemists disagree—but your liquid ban isn't mitigating it. Instead, I have the sinking feeling that you're defending us against a terrorist smart enough to develop his own liquid explosive, yet too stupid to read the rules on TSA's own website.

Kip Hawley: I think your premise is wrong. There are consequences to coming to an airport with a bomb and having some of the materials taken away at the checkpoint. Putting aside our layers of security for the moment, there are things you can do to get a TSO's attention at the checkpoint. If a TSO finds you or the contents of your bag suspicious, you might get interviewed and/or have your bags more closely examined. If the TSO throws your liquids in the trash, they don't find you a threat.

I often read blog posts about how someone could just take all their three-ounce bottles—or take bottles from others on the plane—and combine them into a larger container to make a bomb. I can't get into the specifics, but our explosives research shows this is not a viable option.

The current system is not the best we'll ever come up with. In the near future, we'll come up with an automated system to take care of liquids, and everyone will be happier.

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