[jagged-chisel]

But it's the parts that are easily forgeable (fingerprints, retinas, etc) that are being relied upon. By "forgeable" I mean "things that someone else can also have by creating copies."

I don't think we have yet good metrics on how to detect specific individuals using a full-body scan. Not to mention the invasiveness of creating your personal initial dataset. Most folks won't stand for it. So right back to parts that are forgeable...