In Europe, all countries take care of their customs themselves, but it's mostly random checks, intelligence, you just walk past the line. Most European countries have signed into Schengen Agreement and they have joined immigration procedures. Italy and France are in, UK is not.

If you are flying between two countries that are both members of the Schengen Area, you generally do not go through passport control (Immigration), but you are still subject to Customs regulations. While there are no permanent "customs booths" for travelers within the Schengen zone, authorities have the right to conduct spot checks to prevent the smuggling of illegal goods, excessive amounts of alcohol/tobacco, or large sums of cash (usually over €10,000). In 2026, a major change occurred regarding small parcels: from July 1, 2026, the EU removed the €150 customs duty exemption for imports from outside the bloc, but this does not affect personal luggage moved within the EU. It is important to remember that some EU countries (like Ireland) are not in Schengen, and some Schengen countries (like Switzerland or Norway) are not in the EU. When flying between these "mixed" zones, you will likely pass through both passport control and a standard customs "Green/Red" channel to ensure compliance with both immigration and tax laws.