Comment by toomuchtodo 13 hours ago
Finger prints require physical contact, facial recognition can be done at a distance and dragnet style. Think Flock Group/Safety ALPRs (automated license plate recognition), but by face instead of license plates.
Broadly speaking, you don't have a right to privacy having your photo taken in the US. Is this a fourth amendment violation? I don't know. What is the difference between a face scan and a photo? More detail and accuracy is going to require close range facial depth mapping via infrared, versus facial recognition using photos or live video feeds.
> Finger prints require physical contact, facial recognition can be done at a distance and dragnet style
I'm sure there are lots of existing (pesky) laws about grabbing people and force-taking their fingerprint, or similar, while maybe not so many of those laws against taking a quick picture of a "suspects" face.