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There have been virtual fences, real fences, increased patrols and night-vision cameras. Now the latest initiative by the US to seal its increasingly porous border with Mexico harks back to one of the oldest approaches: dig a moat. City officials in Yuma, in south-western Arizona, have come up with a scheme to create a "security channel" along the nearby border by reviving a derelict two-mile stretch of the Colorado river.
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