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Question: Why does Homeland Security collect fingerprint data from foreigners?


I've been wondering why Homeland Security collect fingerprints from foreigners.

I know it is a matter of security. However, if that's the reason, shouldn't other countries also collect biometric data from foreigners?

I'm not complaining about what Homeland Security does. It is great to keep the US safe, and it is their job to do so. Also, I am exempted from the scanning process. However, I'm just curious.

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