Originally Posted by
chgoeditor
Because there's no such thing as "international transit" in the United States, you'll be held to US alcohol limits. Though as mnbp mentions, it's rare to be assessed a duty for reasonable amounts, in part because it's a huge hassle for Customs agents.
I don't think this is correct. The customs declaration form instructs visitors to "Declare the value of all articles that will remain in the United States." Visitors aren't required to declare articles that will leave the United States, since that would basically be the entire contents of one's suitcase! (In other words, for visitors, it makes no difference if the goods were brought out from home in Canada to Europe and then back home through the US, or acquired abroad, if the goods aren't staying in the United States.
https://www.cbp.gov/sites/default/fi...tion-6059b.jpg