I've only been traveling with solids/powders/towelettes for the last several sets of flights. Even though the bottles and jars are the same shapes/sizes as if they had liquids in them, nobody at security has wanted to inspect them. I am a little surprised. Aren't they supposed to be able to tell from the shape of the containers or do they have some way to see liquids, like they're a different color on the monitor or something?