Hard to guess. This would have to be people who still look like a dead-ringer for a criminal even to a human who compares their face to a database photo, and who are not able to supply ID to prove that it's just coincidental resemblance.
Police have always relied on facial recognition, just not facial recognition carried out by machines. We accept imperfect facial recognition from machines if it is faster, and leaves less work for humans to deal with.
