Originally Posted by
Shareholder
I once had one of those small water bottles AC provides with economy class international meals in my carry on. It had about a half inch of water left. I was told that I had to go back through security, dump the water or bottle, then re-clear security! The bottle, completely empty, was acceptable. With an once of water, it was illegal. Another time, I was told I could not take three miniatures of whiskey (in 50 ml bottles) through security.
In each case you should have solved it by drinking the evidence. The idea that 50 mL of water is dangerous in a 500 mL bottle is an example of how dumb things have become.