There was some story about Canadian licence plates being noted at US gun shows and those vehicles searched when they re entered Canada....don't know if this was verified or not...but with the computors they have now,even Canadians that have travelled to the US for years are being disallowed in for decades old minor offences( possession of pot in the 60's) ....you know when they ask you' when did you enter the US?'-they already know, because it's on the screen right in front of them,the camera recorded it,they're just seeing if you are telling the truth. My wife ,who is a US citizen, travels to Bellingham every month to look after her challenged sister ,and they have a record of every time she entered and left....Big Brother IS watching...
The fact that it's grossly unfair and unjustified is irrelevant,it's their country and their law...just like US citizens trying to tell the judge it's their 'right' as a US citizen to carry a revolver when they enter Canada and are caught....