The one that I frequently hear of as a layman (not a lawyer) is Toronto Pearson Airport's Preclearance, which has a very strict and narrow view of the TN Status eligible occupations.
Obviously anecdotal but I've had zero issues with preclearance at Pearson as a TN holder, both crossing and when applying for TN. They usually just ask me some combination of where I work for, what I do, and if I know when my TN expires, and that's it. My experience applying there has also been incredibly uneventful. I guess engineering is a bit easier to do though, especially if you have a strong application that's been done by lawyers.
I've been given hell by immigration about my TN when flying directly into US airports though.
ridgewell|9 months ago
pyreko|9 months ago
I've been given hell by immigration about my TN when flying directly into US airports though.