Mr. Gaudet, we advise passengers to check with CATSA, which publishes the information on its website. We do so as well, as do airline companies. If you do a quick search on any website, and I personally have consulted a number of them, you will see that all major airlines publish the list of prohibited objects. Over the holidays, as the instructions changed, the information changed on a daily basis.
On April 20th, 2010. See this statement in context.