Same person or different person? Most people are extremely good at recognising faces of people they know well, but not so much strangers. See how well you perform on the tests in this story.
CCTV cameras are becoming a “normal” feature of public life, tracking peoples’ movements as a matter of course.
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The death of the Brazilian electrician at the hands of the Metropolitan Police was a notorious case of mistaken identity. The same thing would probably happen today.