So "THEY" can authenticate you.
What this might have to do with "who you really are," I don't know.
This technology exists today.
I will tell you that any type of technology you see out there today is most likely real old news to "THEM."
( I don't like the rule that punctuation goes inside the quote. The "dot" is a reference to/part of the whole preceding line NOT necessarily what is in the quotes.)
Like I have said in previous posts, "THEIR" technology (I surmise) is such that they can "grab" anyone (or group) out of the air and put them under their control. (Concerning mind control.)