I don't think they try to see exactly who you are. The one time I saw them use the stuff, they were also listening to what we were saying and identifying people by what we called them (e.g., Dr., Dad). Another time, they were identifying people by what we were wearing. Both times were on dove fields around here. With the binos, they were also able to see who killed what out in the open. Some idiot shot at a hawk thinking it was a dove that day. Lucky for him he missed it.

mistake a hawk---for a dove---Now thats a close call

As you can see, I started that sentence out with "Some idiot."