The SIS is a Europe-wide database for alerting wanted or missing persons or objects. It is used, for example, to deny entry or residence in the Schengen area, search for persons based on criminal offences, search for missing persons, or seize objects from criminal proceedings. The SIS is thus an essential instrument for police cooperation in Europe.
The second-generation Schengen Information System (SIS II) has been in operation since 2013. Thirty states are involved in this search database, including the member states of the EU (except Cyprus) and the associated Schengen states Iceland, Liechtenstein, Norway, and Switzerland. After Brexit, Great Britain is no longer an EU member state or Schengen state and thus no longer has access to SIS II.
Authorities entitled to access are national law enforcement, judicial, and certain administrative authorities. In addition, EUROPOL and EUROJUST also have limited access to the SIS. However, access is only possible to data required to fulfil the respective authority´s tasks.
Each Member State has a national central office called SIRENE, responsible for the national and international exchange of information on wanted persons entered in the SIS. The SIRENE office is in Wiesbaden’s Federal Criminal Police Office (BKA) in Germany.