The Po-Po

Americans and Hong Kongers aren't the only ones being harassed, it happens in Canada too.
This guy is riding along in his pick-up not bothering anyone just towing his trailer.
Suddenly the Ontario Provincial Police pull him over and ticket him.

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I don't know if there was anything in the 53 foot trailer.

Is there a difference between what one can do and should do?

Or can do and can do legally?