Pray tell what are these mystical chemicals that can turn the human body into a fireball? I majored in Math, Physics, and Biology (prior to going to medical school), and I have never heard of such a chemical that can be injested, and cause combustion of the flesh. It would have wonderful applications putting crematories out of business. Even a large plug of a reactive salt metal such as sodium would not have this kind of effect. I think I must call BS on Nimrod's post!!!
Also, with respect to profiling, I think it is stupid to profile. I say this not because I am some bleeding heart (far from it), I just don't want to underestimate how ruthless the terorists will be. They could kidnap some sweet 80 year old grandpa's grand-daughter, and tell Pop's to carry a weopon on the plane, or else they cut the grand-daughters head off. It's best to check everyone.