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sorry for the logorrhea, but it's worth noting that the Bundespolizei in Germany was the Bundesgrenzschutz until 2005, when it was reorganised and redeployed as a more general federal police force precisely because most of its border control functions were no longer needed. Yet now..
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because the most obvious thing about these controls is that if they're justified as necessary to deal with exceptional circumstances, after a few years those circumstances are now routine, not exceptional, and dealing with them should be a part of day to day policing, not via an exception mechanism.