A false negative would be when there is a bad actor in the image but the system did not flag them as such. This is the true failure rate of these systems and a metric I don’t see published anywhere.
See the difference? When the system which the police rely upon fails to notice that a terrorist is walking down the road, there is a good bet the police will not be interacting with the terrorist but instead will be clearing 90% of the people the system did flag.
