Some countries don't allow you to bring batteries over a certain size on the plane, that could be the issue. Also, some people make efforts to disable their devices to make it harder to search them when leaving a country like the U.S.. If you dont have a battery or charger with you and the device is encrypted most airport security will give up. I know one person who only crosses boarders with a blank computer and then remotes into his computer at home for exactly this reason.

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