I once helped build a fingerprint processing system. One of the things I learned is that police technicians essentially photoshop fingerprints before searching

I once helped build a fingerprint processing system. One of the things I learned is that police technicians essentially photoshop fingerprints before searching to ensure the best possible match. It took a lot of the shine off of the process and made it clear that as high-tech as things seemed, there were a lot of organic factors at play that were hard or impossible for a computer to sort out by itself. I expect facial recognition has similar constraints. Edit: Conjugation