Like every other technological development, some people will use it for illegal purposes, and law enforcement will be unable to resist the vast database at their fingertips.
“...law enforcement will be unable to resist the vast database at their fingertips.”
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There is NO database of Apple’s facial recognition software. Apple INTENTIONALLY, for the benefit of their customers’ security/privacy, designed it so Apple doesn’t collect the data and is, in fact, incapable of accessing that data which resides in ONLY one place...the customer’s iPhone. See post 9 above.