Verifications of the correct application of the rules have been carried out through spot checks in several participating States (via the Schengen evaluation mechanism) regarding: police cooperation (in Estonia, Latvia and Lithuania), air borders (in Poland, Slovakia and the Czech Republic), land borders (in Estonia, Latvia and Lithuania) and visa (in Estonia, Poland and Slovakia).
Kontrollitud on politseikoostööd (Eesti, Läti ja Leedu), õhupiire (Poola, Slovakkia ja Tšehhi Vabariik), maismaapiire (Eesti, Läti ja Leedu) ja viisaküsimusi (Eesti, Poola ja Slovakkia).