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Step 1: get Estonian e-citizenship by giving them your fingerprint to keep in their centralized database

Step 2: NSA, GCHQ, Russia and China steal the whole fingerprint database, which includes your fingerprint

Step 3: Now your iPhone/Android phone that uses fingerprint reader is vulnerable to hacking

From personal experience, the US has been fingerprinting non-US nationals at the airports for a decade now. So NSA has had such a database for a significant time. However, I still doubt they have figured out to hack the iPhone using said database. But this is just my personal opinion...

Minor nitpick, but as Canada is not part of the US visa waiver program, Canadian citizens are also exempt from fingerprinting when entering the US.

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