I was coming back from Vegas and when I went through the x-ray machine the lady asked if she could check my backpack. I had forgotten to throw out a water bottle (1/3 full) that I had brought with me. They were very nice about it and said that I could go back out and drink it if I wanted. I told her she could throw it out because I had meant to toss it, but it slipped my mind trying to find the correct terminal. I had heard a recent blurb on the news that they are not screening liquids correctly. It's good to know that at least that they can.