> They could then tell from her stamps, that she had overstayed her visa in the Schengen area, and would not permit her in, if she entered the Schengen area out

> They could then tell from her stamps, that she had overstayed her visa in the Schengen area, and would not permit her in, if she entered the Schengen area outside Denmark and without the residency card. All Frontex (Schengen border control) officials have access to VIS, the Visa Information System, which is part of SIS, the Schengen Information System. As a result, they can verify residency status with nothing more than name and date of birth (or, of course, from a passport).