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That's a good argument against using fingerprint scanners as the only choice for authentication. They're not very secure, because they can potentially be stolen and faked.

However, it's not at all an argument against using fingerprint scanners as an optional choice for authentication, just because the scanner could be used to steal your fingerprint.

Fingerprint theft is a problem regardless. You can't really target systems that enable that theft, because it's an ever-present risk. Instead, worry about systems which fail due to such theft.

Fingerprints are fine for a gym, because who cares if somebody fakes yours. They're fine for a smartphone for many people, because it's intended to stop casual theft, not be an impenetrable barrier. Fingerprints should definitely not be used (at least on their own) for, say, nuclear launch authorizations or other things of similar import, because they can be stolen and faked.

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