Funny, when I was moving to America's most Liberal State, California, my first experience was to be stopped at a checkpoint and have the contents of my entire moving truck searched for foreign fruits, plants, and animals (nice names for Illegal Aliens) and this was before 9/11. I'm 30 and I still get carded for alcohol. I would think that when using public transport such as planes, subways, and now buses, sometimes you give up your privacy (or ID) for the benefit of society. I don't like it, but thats the way it is.