system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do they know there are no matching finger prints?
gpt
They arent completely unique, mathematically speaking. Testing for prints is based on probability.

The odds of someone having the same fingerprints as you that lives in the same area as you is incredibly, *incredibly* small. 

Fingerprint matching is used to reduce the likelihood of the prints belonging to someone other than the suspect.

It works similarly to testing blood at a crime scene. It isn't to prove with  100% certainty that it's the suspect's blood. It's used to rule out the 99% of every other possible suspect.