Coming from a naive Canadian's perspective, my understanding about the TSA's usage of WBIs is that they use backscatter x-ray technology and the health effects of said technology have yet to be fully understood. Canada, on the other hand, uses millimetre wave technology, which does not seem as penetrative as x-rays. Heath Canada has gone on the record saying that these scanners are safe to use (much akin to the US gov't about backscatter tech) but have there been any studies contradicting these findings?

Aside from the potential of function creep by the gov't, I'm not too concerned about people seeing my body naked (hell, I'd walk through naked no problem if they wanted me to :P). I am, however, more concerned about the potential health effects of the technology and its potential as a cancer-causing agent.

I would also be interested in knowing if there is as much resistance to WBIs in Canada as there is in the US. I don't recall there being a lot of uproar in the media except when it was first rolled out. Anyone come across any agents storing images and the like?