From my families experiences when they did the random searches at the gates they would announce that it will be happening to let us know about them, so if we were picked it would not catch us by surprise. When they did not announce it at the gates they never did it, because we never saw this happening while others were boarding since our row and the other rows around us were not called to board the plane.
I am not saying the information you found was false or anything, so all I can do is report on what I have seen.
Transport Canada may hide certain items on board, and then perform a surprise inspection prior to boarding to see if the cleaning crew and/or cabin crew found the object(s). I can assure you that when the inspection fails, it is not pleasant for anyone involved. Again, however, the infrequent traveller will only be aware of a slight delay in departure time 
I respect them for their politeness and assumption that I was honest, but...... 
. I learned that early on in India... don't be like the woman who was late for her flight in Delhi, and started screaming at every military person in sight, telling them how stupid/dirty/ugly their country was.
If only they will come to their senses about liquids.Why does one need a lighter on a non-smoking flight from one non smoking airport to another?![]()

Sometimes a plane doesn't always go where you think it's supposed to go these days.
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Ever seen survivor? It doesn't look like it's that easy to start a fire without one.
I was just reading the article posted today on the TSA website and the threat level is raised to orange? Has it always been orange or was it just raised as a result of these findings?
I think we are going to face this type of random search forever. I just hope the government knows more than I do and are taking the necessary action to protect us.

The "goverment" might. The TSA....... Unless the terrorist walks up an "introduces" himself.....![]()
The TSA has formally announced that ORANGE is the "normal" level. (Does anyone remember the boy who cried WOLF???? At this point they have "wasted" whatever crediblity they had!)
My favorite is the "puffers" that check for explosives. The TSA uses these SO WELL!!!! First in some cities (JAX for example) the passenger PICKS the machine. (So if I am a terrorist who has been playing with explosives would I pick (A) the old fashioned machine or (B) the puffer that detects explosives. TSA VOTES B....) And then experts say that the most likely place to detect explosive residue is on the SHOES. So what does the TSA do? Have you take your shoes OFF and put them in the xray bin which CANNOT detect explosive dust while you walk through the puffer which CAN!!!![]()
Are we safer today then pre 9/11? Sure. But IMHO its due to the work of REAL law enforcement not that "pseudo" group called the TSA!
what you mean. I just hope they know more than me. I pray they know more than me.
I still feel DRAMATICALLY safer in the air then I do on the Atlanta interstates.......