This case is important because the ruling would appear to apply to any traveler that is carrying digital information across a border checkpoint.

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At the Wagah border checkpoint in Punjab, picnicking families gather to gape and wave to Pakistanis waving back from the other side of the barbed wire.

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It will have the power to detain people for criminal activities including terrorism - not just customs and immigration offenses - and will combine passport and customs checks in a single border checkpoint, Brown said.

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"Knowing what I know about the technology, and knowing that these individuals entered this country through a border checkpoint through Canada, there is a high probability that they would have been identified had FaceIt technology been in place to capture their images and match them against the data bases that they were supposedly included in the 'watch list, ' " Atick says.

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Earlier, on Friday, Syrian troops retook a checkpoint on the north-eastern border with Lebanon at Yaarubiyeh, captured a day earlier by Islamist fighters, reports said.

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On Tuesday, Turkish gendarme units established a checkpoint blocking civilian access to the Cilvegozu border terminal.

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On Monday afternoon, Turkish officials said, a minivan drove from the Syrian rebel-controlled side of the border compound and parked next to the first Turkish checkpoint.

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When painting the start of the stripe at Checkpoint Charlie, a former east- west border-crossing where new building has almost entirely blotted out the past, Eberhard Diepgen, Berlin's mayor, felt obliged to calm unease by declaring that there was no intention to split the city again.

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Think of a border protection agency that could use iris recognition at an airport's customs checkpoint, or a police or law enforcement agency that needs to verify identities on the go and can't afford large, cumbersome hardware to do so.

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