How is supervision exercised?
The Estonian authority that is responsible for the national part of the Schengen Information System and through which data is entered in the Schengen Information System is the Estonian Police and Border Guard Board.
Also, every member state appoints a data protection authority, which checks that the rights of persons are not breached when SIS data are entered and used. This supervision authority in Estonia is the Data Protection Inspectorate. The supervision authorities cooperate with each other.