Earlier quoted context omitted.
That's sad. Border staff often have a set of rules they have to follow, a lot of it is to ward off attempts at illegal migration. Getting into America or Canada via that border is rather common. When I was at the Canadian border once, a woman from Jamaica, with a carload of luggage was denied entry essentially on the same basis - no proof of return travel, reservations etc. - they essentially suspected she was trying…
I didn't get a good feeling from your comment's contrast between "a woman from Jamaica" and "normal folks". Surely being from Jamaica is a thing that normal folks do, if that's where they're from.
B) A lone Jamaican, with a car full of luggage
C) No travel reservations
D) Jamaica is a poor country, likely higher rates of immigration issues.
These are red flags.
The 'border game' is a game of probabilities.