The open question here is who does this effect. If the result is 1000 wrong arrests out of 10mil, that might be acceptable. But if ever one of those arrests is that 1 poor guy who get's arrested every time he steps out of his house because his face is a universal match, that's a very different result. Ditto if this leads to large numbers of incorrect arrests in certain groups (race, gender, age etc).

This is the problem with anything involving people: distributions matter a lot and distributions are hard...