Yes. Amsterdam Schiphol is policed by the Royal Netherlands Marechaussee (KMar), which runs deep database checks at border control. A third-country Interpol diffusion or SIS II alert will trigger detention at Schiphol, including during airside transit.
Amsterdam Schiphol is one of Europe's major transit hubs and one of the most thoroughly policed airports in the Schengen area. The Royal Netherlands Marechaussee (KMar) — a military border police force — operates passport control and transit screening at Schiphol. Unlike civilian border police in some other countries, the KMar has a specific mandate to conduct transit screening, meaning that passengers connecting between non-Schengen flights without entering the Netherlands can still be queried against Interpol and SIS II.
How Schiphol Handles Interpol Checks
The KMar queries SIS II, Interpol's I-24/7 integration, and Dutch national databases at passport control, including the transit area. When a passport is scanned — whether at a primary desk, an e-gate, or a transit screening point — the terminal checks for Red Notices, diffusions, SIS II alerts, and national watchlist entries. A match triggers detention, and the KMar processes the provisional arrest.
Schiphol is unusual in that transit passengers — those who do not enter the Schengen area but connect between non-Schengen flights — are also subject to screening. The KMar operates a transit-screening programme that queries passenger data against databases, and a match can trigger detention even where the passenger has no intention of entering the Netherlands. This means that routing through Schiphol to avoid Schengen border control does not avoid the database check.
Critical Warning for Travelers
Schiphol's KMar screens transit passengers, including those connecting between non-Schengen flights. A third-country alert will trigger detention even during airside transit. Do not route through Amsterdam if you suspect any alert — the transit screening programme means that avoiding Schengen border control does not avoid the database check.
The KMar's Transit Screening Programme
The Royal Netherlands Marechaussee (KMar) is a military border police force that operates passport control and transit screening at Schiphol. Unlike civilian border police in some other countries, the KMar has a specific mandate to conduct transit screening — meaning that passengers connecting between non-Schengen flights, who do not enter the Netherlands, are still subject to database queries. This is a critical distinction from other Schengen hubs, where transit passengers may not be screened.
The transit screening programme queries passenger data against SIS II, Interpol's I-24/7, and Dutch national databases. The data is collected through APIS (transmitted by the airline before arrival) and through passport scans at the transit gate. A match triggers detention, and the KMar processes the provisional arrest. The passenger is transferred to a detention facility, and the Dutch extradition process begins.
This means that routing through Schiphol to avoid Schengen border control does not avoid the database check. A passenger connecting from a non-Schengen origin to a non-Schengen destination, without entering the Netherlands, is still screened by the KMar. The only way to avoid the check is to avoid Schiphol entirely.
Dutch Extradition Procedure
The Dutch extradition process is governed by the Dutch Extradition Act (Uitleveringswet) and the applicable treaties. A person detained at Schiphol on an Interpol alert is brought before a magistrate (rechter-commissaris) for a detention review. The court assesses dual criminality, the validity of the request, and any bars to extradition. Bail is possible, subject to the court's assessment of flight risk.
The Dutch courts apply a human-rights filter, consistent with the ECHR. Defence arguments citing Article 3 (prison conditions) and Article 6 (fair trial) are well-established in Dutch jurisprudence. The decision can be appealed to the Court of Appeal (Gerechtshof) and, in some cases, to the Supreme Court (Hoge Raad). A parallel CCF deletion petition addresses the underlying Interpol notice and can resolve the matter at the root level.
The KMar's Jurisdiction Over Transit
The KMar's jurisdiction over transit passengers is a distinctive feature of Schiphol. Unlike most border police forces, which have jurisdiction only over passengers entering the country, the KMar has a specific mandate to screen transit passengers — those who do not enter the Netherlands but connect between non-Schengen flights. This mandate is based on the KMar's status as a military force with border-security responsibilities, and it means that transit passengers at Schiphol are subject to the same database queries as entering passengers.
The transit screening is conducted at the gate or at a designated transit-screening point. The passenger's passport is scanned, and the terminal queries SIS II, I-24/7, and Dutch national databases. A match triggers detention, and the KMar processes the provisional arrest. The transit screening means that routing through Schiphol to avoid Schengen border control does not avoid the database check — the KMar screens transit passengers independently. This makes Schiphol one of the few airports where a transit passenger with an alert can be detained without entering the country.
What to Do in Practice: Secure Your Clearance
Amsterdam Schiphol is policed by the KMar with deep database checks, including during airside transit. A third-country alert will trigger detention. If you suspect an alert, avoid Schiphol and complete a pre-travel audit through counsel before flying.
If you suspect your name is on an international watchlist or have an upcoming flight, do not leave your freedom to chance at a passport terminal. A confidential Interpol lookup or a comprehensive Pre-Travel Legal Check filed through Swiss legal counsel secures absolute clarity within days. Contact our Basel office confidentially to secure your legal travel shield.