The End of the European Customs Union
Denmark had reintroduced border controls. They are limited how far they can go with reintroducing controls at the border by previously signed treaties. But checkpoints there will be.
As Denmark Reintroduces Border Controls, Is The Heart Of Europe - Its Customs Union - About To Flatline? Tyler Durden, Zero Hedge, 11 May 2011
And while Denmark is the first to officially defect, even under a palatable explanation, it surely won't be the last: "The idea of controls at borders within the EU, also defended by Italy and France, was pressed by the far-right Danish People's Party and its head Pia Kjaersgaard, who argued controls would counter illegal immigration and organised crime." One thing we have seen in Europe is that courtesy of the relentless ebb of austerity, the far-right is progressively gaining a foothold in every country. And one can be certain that the populist whiplash against all things European, will not be contained to merely the monetary arena, but will rapidly devolve to restoring borders, following which the EU will exist only in history books.