There's a television ad that stands out in my memory from when I was a kid (80s). The camera pans across patrons at a diner and the voiceover is about how a kidnapped child was recovered as the camera stops on a young girl (~8yo). The child is described, but the child the camera landed on has different features (hair dyed, cut, whatever). The explanation for how she was identified is that her fingerprints were on fil…
Fingerprints aren't even particularly useful here. Our irises are considerably more information-dense, accessible and stable over time as evidenced by the famous identification of Sharbat Gula: https://www.cl.cam.ac.uk/~jgd1000/afghan.html A close-up photo should be enough to reliably identify a person years after they went missing.
Although that depends on the number of cameras around, access to them, and how much they are recording. Fingerprints are a lot simpler and easier to access.