Is peanut butter a liquid?

I am sitting in the Las Vegas airport as I write this post (just finishing our Utah hiking trip, not gambling), pondering this question because my peanut butter was confiscated by TSA when I went through security. When the screener took my daypack, my immediate thought was that I had left my First Aid kit in it with its scissors and needles. But no, she pulled out my jars of left over tahini and peanut butter that I had been planning to put on my left over bagels for the long trip home. Frankly it didn't occur to me that the prohibition against liquids would apply. The screener was nice; she allowed me to take my contraband back out of security and spread it on the bagels and then toss the rest. And in the process I met a woman who had just been busted for two bottles of unopened gatorade; she couldn't chug them both so she gave me one. But does all this make me feel safer? I wish it did. -- Marian