Originally Posted by
Voyager0927
if you can shop duty-free after clearing U.S. Customs, how do they know whether you've exceeded your allowance
At YVR I have very
occasionally seen US customs inspectors wandering about the 'transborder' area performing inspections of people's duty-free bags. I assume the same happens at YUL, but it's probably rare.
All that being said, liquor in Canada is rarely a deal. Why don't you just pick up a bottle in Vegas? You'll probably pay the same, or less.