Screens for an advanced monitoring system, which includes th

POLAND - NOVEMBER 28: Screens for an advanced monitoring system, which includes thermal detection cameras, sits in a boarder patrol office in Medyka, Poland, on Wednesday, Nov. 28, 2007. The Schengen region, named for the Luxembourg town in which the agreement was first signed in 1985, now allows unhindered travel between 13 western EU countries plus the non-EU states of Norway and Iceland. The U.K. and Ireland, both EU members, have opted out of the program. (Photo by Marcin Przybylko/Bloomberg via Getty Images)