@bythewell - That might be a little bit over-dramatic. It's definitely something they are going to have to legislate properly, but I don't see how it's any different from having security cameras around in general. It just speeds up the search if the police are looking for a criminal.
And I think the technology is almost inevitable. But really, it would be so easy to fool if that was actually a concern. All you'd need to do is wear a fake nose or even just keep your hat down over your eyes.