If the method was specifically targeted at high-crime neighbourhoods, the chance of an accurate match would presumably increase. You could also map the entire p

If the method was specifically targeted at high-crime neighbourhoods, the chance of an accurate match would presumably increase. You could also map the entire population of a country and detect previously unknown "criminal" hotspots. Both are awful, authoritarian ideas, but would potentially give useful information to support regular policing. Thankfully, the most likely application of this technology I can see in the near-future is someone making an app that scores your face for criminality.