[quantified]

Probably room to add little cheek pads or other shape-shifters under the mask.

[verdverm]

You have to change how you walk and sounds as well

[lotsofpulp]

99.9% of people walk around with an electronic device that identifies them. If a particular person doesn’t, it should be trivial to filter out all the people that it couldn’t have been, leaving only a small list of possible people.