Good question.
If I'm leaving, they can stop me when I check my luggage and demand that I remove it. Or no flight. I would comply, because I'm a good boy. Actually I wouldn't, because I'm good enough that I wouldn't put one on going out and make an issue of it in the first place. There's a time and place to fight every battle, and on the way out ain't it.
Inbound, however, what are they going to do? Tell me I can't come into my homely debatable land because I have ugly luggage? OK, they can do their worst, tear it apart and have fun with me, but when they're done and they belatedly realize that once again, for about the millionth time this year, they've utterly failed to find anything remotely connected to terrorism, gun-running, drug trafficking or even double parking, that they've got one middle-aged, semi-professional traveller with no criminal record politely impatient and enquiring who is in charge, they're going to get edgy. Not very, because they've been protected from the worst of their excesses for so long and so many times that they think they're invulnerable; but edgy becuase someone among them must have 2 neurons to rub together. Sooner or later, those neurons are going to rub. Even it is in Transport Canada.