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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
No, mind reading is a hundred orders of magnitude more invasive than any possible search.
There is no possible scenario where it could ever possibly be justified or excused. Your brain is unconditionally sacred. There is no possible theoretical version of such technology that could ever not be pure, unforgivable evil to use without completely uncoerced consent.