As to aviation security, we've asked several times, which is why you would hear the language that the representative from Transport Canada was using about this being part of a multi-layered holistic program. It's because the actual evidence for this program is virtually non-existent. The Privacy Commissioner's office has asked for evidence of the efficacy of such a program; it does not exist that we're aware of.
On April 29th, 2010. See this statement in context.