Everything you mentioned has been possible for several years now: with eyewitnesses, ubiquitous CCTVs, etc. The change will really be in that clearance rates on

Everything you mentioned has been possible for several years now: with eyewitnesses, ubiquitous CCTVs, etc. The change will really be in that clearance rates on crimes will shoot upwards when these technologies are invented. Or criminals will find ways around the technology, as they have done for much of human history. The bigger concern is the possibility of misuse and abuse of such technology, both by the government and by unscrupulous individuals. That is what will make the future dystopian. In fact it has been happening for many years now: think lie detectors and cell phone tower tracking- both demonstrably bullshit, but widely abused nevertheless!