how was it proved that every person has unique fingerprints?
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Unless every single person’s fingerprint can be obtained, loaded into a single database and analyzed for comparison, it can’t really be proven that every fingerprint is unique.
That said, I don’t believe there’s ever been a documented case of any 2 people’s fingerprints matching on all of the unique markers that are measured. Fingerprints are formed in the womb and while genetics plays a role in their formation, other variables such as pressure in the womb, the fetus’ location and position in the womb, and the way the amniotic fluid runs across the fingers. It’s takes roughly 5 months for fingerprints to fully develop.
So you can think of fingerprints forming along the same lines of how a river or stream would form. Every flowing body of water in the world has carved out its path in a completely unique pattern because the conditions surrounding them (environment, altitude, temperature, etc etc) is never identical.
But the best example I can think of to “most proove” the uniqueness of fingerprints is that even identical twins don’t have matching prints, which can be more telling than even a standard DNA test when it comes to differentiating between identical twins. Even in the same womb, the conditions surrounding the fingers of each fetus aren’t identical.
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