Australia and New Zealand already have this, makes clearing customs quicker as long as you don't have a technophobe in front of you.
I'm surprised there hasn't been more of an uproar in the USA about it, sure it makes flying easier, but you want to pay particular attention as to how they will secure this info, are you able to remove it? and what other Government departments have access to it & how are they able to use it.... and that's the biggy.
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