I had to go through the xray machine 4 times because my Palm pilot pen had fallen out and lodged itself in the bottom of my briefcase.
I had no idea what the problem was and when they found it I was stupefied.
The cops generally dont stop you and check you without reason......most times.
But if you are involved in any sort of trouble or even back answer a cop, they will
On the whole though, there is not much to worry about.
Airports are very particular though, there is no wiggle room for error, and virtually nothing is allowed...even some nail clippers or nail files.
The stupid thing......You are given metal knives and forks with which to eat in business class?