As green card holder, I crossed border in Detroit, MI over to Canadian side, just to do a 1 hour tour for fun, but coming back, the custom wasn't as quick, they asked me a bunch of questions like why I crossed the border an hour ago, who Detroit as I currently live in New Jersey, it seemed that there was some discrepancies (I could be wrong) that two officers had to look at the computer to finally let me go as the bus driver (they have special border crossing buses) was waiting for me, along with 10+ other U.S. citizens on the same bus.
I didn't want to cause any delay or trouble so I didn't inquire much. But I do wonder, what was the hold up? They did try to ask me how many times I've been to Canada and when was the last time I crossed to Canada. They seemed very interested in the dates I did all that, not sure why.
I thought why they couldn't just look at their video camera that I actually just crossed an hour ago.
Thanks!
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