“San Francisco is the first American city to ban facial recognition software used by police and other agencies. Bloomberg QuickTake  [YouTube] explains why the technology’s advance is so alarming to regulators, the public, and even the people developing it.”

See also: Government Is Using Most Vulnerable People to Test Facial Recognition Software; GAO Report – Facial Recognition Technology; and Yes, Americans can opt-out of airport facial recognition – and it is not easy.