how are fingerprints not affected by variables like body heat/injury/pressure/etc to the point that we can solve crimes using them?

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As the title says – I’m wondering how we can really use fingerprints accurately, when there could be so many variables which could alter your fingerprint, especially so that a partial print might be altered. Is it just based entirely on the ridges/patterns? Do they really not change much at all, even if you lose/put on weight, are really cold/too warm, damage your skin eg scratch or burn your fingertips, have been in the shower so your fingertips go all raisin-y, or you’re applying less pressure one time and more the next?

Sometimes when I’ve been in the bath or have been cleaning or whatever I struggle to unlock my phone with my Touch ID haha, so I wonder how reliable fingerprints actually are.

In: Biology

4 Answers

Anonymous 0 Comments

Some variables actually do affect your fingerprints. I accidentally burnt the skin on my right hand thumb, and my college biometric couldn’t recognize my fingerprints, so I had to write a letter as an alternative.

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