Get Quartz in your inbox

Free daily briefing on global business news.

Things you can't bring back in your suitcase through U.S. customs

U.S. customs can confiscate or fine you for these foods, plants, medications and souvenirs — 10 categories to know before you pack

Customs clearance looks like a formality, right up until an agricultural inspector opens a bag and a souvenir goes into the bin. That moment is where travelers lose cash, keepsakes or both. The rules applied at U.S. customs come from several agencies at once. Customs and Border Protection enforces them at the airport. Most of the restrictions originate elsewhere — with the U.S. Department of Agriculture, the Fish and Wildlife Service, the Food and Drug Administration and the Treasury Department. The result is a patchwork that rarely matches a traveler's instinct about what counts as risky.

A jar of homemade jam from a relative's kitchen can be treated the same way as an undeclared commercial shipment. A piece of coral pocketed during a beach walk can turn into a federal wildlife matter. A cured sausage sold openly in a European supermarket may be refused entry, while a canned version of the same meat clears without comment.

The logic underneath is steadier than the specifics suggest. Fresh farm products can introduce pests and pathogens that U.S. crops and livestock have never faced. Some animal products feed the illegal wildlife trade. Other items are blocked for reasons with nothing to do with biology, including trade sanctions, trademark law and agreements that protect other countries' cultural heritage.

What follows covers 10 categories of goods routinely seized, fined or held for permits at U.S. airports and border crossings. Some are banned outright. Others are allowed in limited quantities, from certain countries, or with paperwork a traveler would have to arrange before leaving home. Knowing the difference before packing saves time and money.

One rule applies across all of them: declare everything. A declared item that turns out to be prohibited is usually just taken away. An undeclared one can bring a civil penalty on top of the confiscation, plus a violation record that makes future border crossings slower.

Fresh fruits and vegetables from most countries

Fresh produce ranks among the items U.S. Customs and Border Protection confiscates most often. Fruits and vegetables can carry insect eggs, larvae and plant diseases that have not taken hold in U.S. orchards and fields. Apples, citrus, mangoes and potatoes are routine finds in airport seizure bins.

The threat is specific rather than theoretical. Fruit flies lay eggs inside ripening fruit, and the damage is invisible to a traveler packing a bag. One infested piece can seed a local population, and eradication then means quarantines, trapping grids and years of monitoring. Citrus greening, also called huanglongbing, moves through plant material and the insects carried along with it. The disease is behind the collapse of much of Florida's citrus production.

Permission depends on both the item and its origin, which is where travelers get lost. A mango may be admissible from one country and refused from the next, because pest pressure differs by region. The USDA's Animal and Plant Health Inspection Service, known as APHIS, maintains the lists that CBP agricultural specialists work from. Those lists change as outbreaks flare or fade abroad.

Two assumptions cause most of the trouble. One is that fruit bought in an overseas supermarket must be cleared for travel because it was sold commercially. The other is that a few pieces picked from a relative's garden are too small a quantity to matter. Neither holds up. Origin governs admissibility, not packaging or volume.

Processing shifts the odds. Dried fruit and commercially canned or jarred vegetables generally face lighter restrictions than their fresh equivalents, though neither clears automatically. Anything with soil still clinging to it draws the hardest look, since soil is regulated on its own terms for the nematodes, fungi and bacteria it can hide.

The practical step is to list every piece of produce on the customs declaration and let an agricultural specialist rule on it. A declared mango that turns out to be prohibited goes in the bin. An undeclared one found during an inspection can bring a civil penalty worth far more than the fruit.

Most fresh meat, poultry and egg products

Fresh, frozen and dried meat from most countries cannot enter the U.S. without USDA certification, and individual travelers almost never hold that paperwork. The rule covers cured products people assume are exempt because they need no refrigeration, including Spanish jamón, dry sausages and other charcuterie bought at a reputable shop abroad.

The reasoning is animal disease control, not human food safety. The viruses behind African swine fever, foot-and-mouth disease and highly pathogenic avian influenza can survive in meat products. One discarded scrap that reaches U.S. livestock or poultry could cost an entire sector its export markets. A vacuum-sealed, commercially labeled package from a European or Asian supermarket is therefore treated much like a sandwich carried out of a hotel breakfast buffet.

A narrow set of exceptions covers fully cooked, shelf-stable and commercially canned goods, and certain canned meats from certain countries are admissible. Those permissions hinge on the animal disease status of the country of origin, which shifts whenever an outbreak is reported. A product that cleared the border last year can be refused on the next trip, with no change to the packaging or the traveler's intent.

Poultry rules change the fastest, since avian influenza spreads quickly and prompts immediate adjustments to what inspectors will accept. Egg products sit in the same framework. Preserved........

© Quartz