I'm not. We're not aware of any studies on that. I'd clarify that it was a policy decision by the government to not have a prescribed definition for national security on the basis that the types of threats that Canada could face from period to period can change. Given the evolving nature of threats, you wouldn't want to have a definition of national security that precluded you from considering certain specific types of threats.
On May 21st, 2013. See this statement in context.