I didn't ask to be patted down, but was randomly chosen as I proceded to the international departure lounge from customs. It appears that our laws are different, in that you don't choose to be patted down, you are selected. The officer undertaking the check was very polite and efficient. She carefully explained the process and a few minutes later I trotted out no worse for wear. I was a little quizzical as to why a YOUNG middle aged, white woman was chosen from the throng for this procedure. No hassle and I was off to wait for departure and it gave me more material for my first email back home.