However, items sold in airport duty-free shops are usually safe to bring back from your trip abroad. In the U.S., you will be asked to fill out a U.S. Customs Form to declare any purchases made abroad.
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Travelers should declare all items being brought from abroad that will remain in the United States. This includes gifts and duty-free purchases. Goods purchased in a duty-free shop are not automatically free of duty upon your return to the United States.
We'll get into specifics in a bit, but as a general rule of thumb, anything you obtained abroad needs to be declared. Some examples include: Purchases made abroad, including gifts for friends and family or something you will use or sell in your business.
TSA Rules and Liquid Duty Free PurchasesThis means that you can purchase duty free liquid items, such as perfume or liquor, at a duty free shop outside the US and put them in your carry-on baggage for the international leg of your trip only.
Coffee (Roasted, Green, Whole, Seeds, Plant Parts)Roasted Coffee: Travelers are permitted to bring unlimited quantities of roasted coffee in their luggage without restriction through any U.S. port of entry. However, as with all agricultural products, you must declare the product at entry.
Officials at customs and immigration are checking travelers for things like whether they have the right documents to be in the country, whether they're legally allowed to be there, and whether they're bringing anything illegal with them.