I wonder if the question of guns came up because msp ran the tag and not due to the sticker.
No doubt.
When I took the family to Niagara Falls, ONT, CA; we drove. At the crossing, I was asked specifically if I owned a hand gun. I was some what surprised by the question (never asked in prior crossings), but I played along. And answered affirmative.
Then I was asked if I had it with me; I didn't and said as much.
We were detained. Told to pull over for an "inspection". A group of officers came over and we were instructed to turn the vehicle off and leave the key in the ignition.
We were forced to sit and watch as our entire vehicle was unloaded, torn a part and left on the ground, including the contents of the bed.
We were then informed we had to go "inside" and explain ourselves.
(Basically, why are you here, where are you going and when will you leave)
We could NOT clean up the mess on the ground first or secure the ignition key, we had to into the building and just leave our belongings on the ground.
After being inside in line for an hour, we were asked a few questions and permitted to go outside and "claim" our belongings from the ground around our truck.
Total delay: 2.5 hours.
I would say it sucked, but the worst of it was my credit card was compromised on the same trip and I ended up with 4 new cards in the space of 3 months.
Basically, I have no plans to go back to Canada again