The Schengen agreement on open borders within the European Union turns 40 this weekend. A cornerstone of EU policy, it allows the free movement of citizens and goods. But many member states are now re-imposing temporary border checks as part of immigration controls, raising questions whether Schengen can survive. DW’s Lucia Schulten reports. Chapters: 0:00 Schengen agreement turns 40 3:34 Jonas Bornemann, Professor of European Law For more news go to: http://www.dw.com/en/ Follow DW on social