Darkside,
I have a small ding on my record, travel across the border every year for the last 10 and went to the Canadian Consulate to get the pardon.(which I cannot get since it is not a conviction but a plea of no contest) You have to go to the Canadian Consulatein the US. Border services might be able to do it but the Canadian Consulateis easiest way in the US and the proper policy. That is all I am saying....A guard can deny you for anything if he is having a bad day hunting or not hunting...

I sat next to guy last year who was sent home for a DUI...Even with the pardoyou still have to answer questions with the immigration officer every year .......makes no differenceto me what people do....I go through it every year and will everytime I go to Canada......what do I know ...I go through every year that is what I know and I am never denied but see many get turned around clueless

Shoot straight..be safe !!!