Do you have to declare everything at U.S. Customs?
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.
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What Do I Have to Declare at U.S. Customs?
Plants, seeds, food, fruit, vegetables, insects.
Meat, animals or animal products.
Disease agents, cell cultures, snails.
Soil, or if you have been on a farm, ranch, or pasture.
You may bring large sums of money with you in the form of cash, money order, or traveler's checks. There is no maximum limit, however, any amount exceeding $10,000 USD must be declared upon arrival on both the Form 6059B and FinCEN 105. All forms must be filled in completely and truthfully.
Most countries require travellers to complete a customs declaration form when bringing notified goods (alcoholic drinks, tobacco products, animals, fresh food, plant material, seeds, soils, meats, and animal products) across international borders.