> Note that absent reasonable articulable suspicion of a crime, law enforcement in the US cannot legally forcibly identify people.Could you cite a source for this?
If a law enforcement officer personally recognizes someone's face, I don't believe that it's illegal for them to know who the person is.
If a law enforcement officer turns to their non-cop buddy and asks "do you know this person?" and their buddy says "yeah that's Joe", I don't believe it's illegal for them to identify the person that way.
If a law enforcement officer picks up a phone and describes the person's face to their non-cop buddy and the buddy says "that sounds like Joe's face you're describing", I don't believe it's illegal for them to identify the person that way.
You can see where this is going, right? At what point does it become illegal to look up a person's face in a store of the-way-faces-look? Where does that become the "forcible identification" you're talking about?
Generally speaking, people expose their faces in public, and so those exposed faces can be remembered, photographed, and recalled without the person's consent or any warrant. This is legal in the USA - there is no expectation of privacy in a public space, and the police don't have to give you any more privacy than a private citizen would. They just cannot search you - and looking at your face, and potentially recognizing it, is not a search.
5/24/2026
at
12:51:55 PM
> They just cannot search youIf instead of looking up your name in a name list, I look up your face in a face list, ain’t that searching?
I feel like what you’re ultimately asking hinges on when, legally, a photo turns into biometrics.
by lelandfe
5/24/2026
at
1:08:36 PM
No, looking up your face in a list of faces is searching FOR you, not searching you.Searching you means taking an inventory of the items on your person. It does not mean looking at you. In some cases, imaging you can be a "search" even where there is no physical contact (for example: a millimeter-wave scanner), but a photograph in a public place has never qualified as a "search" in the USA.
I understand your feelings, but so far as I know things like gait recognition, facial recognition, or even an iris scan derived from an ordinary photograph have never qualified as a "search" under U.S. law. Feel free to correct me if I am wrong on this: it's quite difficult to prove something has _not_ happened.
I think the legal line is not when it "becomes biometrics" or becomes identification. The legal line is when you are revealing a private property about an individual (for example, their blood type, or the contents of their pockets). Nothing visible to the naked eye in public is considered private, so nothing that derives identity from that public information is a "search".
As a nice easy example... an officer smelling alchohol on the breath of a person in the course of a conversation is not a "search". An officer compelling that same person to breathe into a breathalyzer machine is. Applying the same standard to faces, you cannot make an individual put their eye to a scanner without reasonable suspicion, but if you can get a biometric scan from the invidual as they happen to walk about their day, doing that isn't searching them...
by Borealid