And, in the not so distant future after that, it's safe to assume that people will be forced to have chip implants. Why use a camera and ml when you can just tag someone?
Forced? That sounds a bit too 1984-ish. I believe in a more Brave New World future, where people will pay good money to get chipped and the only "natties" (unchipped people) will be people who either cannot afford it, or "wackos".