I would like to know the opt-out rate in Canada where, if you're selected, CATSA is required to disclose to you the nature of the machine and your ability to select a patdown as an alternative to the MMW.

I imagine the real opt-out rate would increase dramatically if the TSA were required to give each passenger selected a similar talk. I believe this would certainly be the case if lines such as "your body will be covered with a low dose of x-ray radiation during the scan, which..." were included in the disclaimer.

Only once - and this was in passing - have I heard a TSO mention to a passenger that the NoS is optional. This was in Boston in early 2010. This was before the masses had heard about the NoS and before the aggressive patdowns had started, even as pilot programs in BOS and LAS.