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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.

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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.

Conversely, preclearance at Pearson royally screwed up my TN visa after claiming that the other ports of entries were doing it wrong. I have received multiple TN from HOU and, in general, I like the CBP at HOU. EWR was always friendly as well in my opinion. I personally prefer getting my TN at land border crossings because they tend to take the "gather all the facts" approach vs. airports have a procedural approach that feels highly dependent on the agent you get. My most recent TN was I-129 which I think is a waste of money but if someone else is paying for it and you have the luxury of waiting in the US, then it's a seamless experience.

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