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It all gets stored onto a network just like police use to track interactions with people. In the case of police forces, they can't afford to store all that information indefinitely so after X amount of time they delete the trivial/minor things. I don't know about border services, but most police forces only dump data that is 10-15 years old (serious stuff stays for ever obviously). I'm guessing border services probably does the same.
So I would say not likely for life but it could be a long time still.
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