It was the travel story of the week:  a 33-year-old Canadian man named  Martin Reisch left on a road trip for the US without his passport, but managed to convince Customs to let him across the border by showing them a scanned copy of the document on his iPad.

As Mr. Reisch told the Montreal Gazette, the US border guard wasn’t particularly enthusiastic about the situation, but after taking his iPad off to another location temporarily, the official waved him on through:

“I guess he looked me up in the computer and saw I’m not a criminal or a terrorist or anything.“He didn’t say much besides ‘Merry Christmas.’ ”

On his return trip, Mr.

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