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Gonna call wasted time on this one. What's the benefit? If anything, it's easier to find a skin flake or a lock of one's hair (Or a saliva sample in more romantic scenarios), than it is to steal a key off of a person. And I at least notice when my keys are gone. Thumb-print locks are already just as uniquely identifying, likely less expensive, easier to maintain, more efficient, and still nowhere near worth it over a metal lock and key.They're working on locks that you will only be able to open by providing the proper sample.