As in many things, a blanket statement of 'not ready for use' isn't really the most helpful way to look at the situation. There's a range of ways such technology could be usefully deployed, even with current technological problems, that might aid law enforcement officers in the field. It's a very wide continuum from zero to "automatically locking people away for life based on a facial match".
As the article says, there are huge concerns about how such tools might be misused, whether legally or not. So the title might more accurately stated not as 'facial recognition software is not ready for law enforcement', but that 'law enforcement is not ready for facial recognition software'. I'm fairly sure there are countries out there where citizens do not lie awake at night in fear of their government, and where such technologies might be responsibly deployed as a tool in law enforcement.
As the article says, there are huge concerns about how such tools might be misused, whether legally or not. So the title might more accurately stated not as 'facial recognition software is not ready for law enforcement', but that 'law enforcement is not ready for facial recognition software'. I'm fairly sure there are countries out there where citizens do not lie awake at night in fear of their government, and where such technologies might be responsibly deployed as a tool in law enforcement.