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<p>It is a matter for the San Francisco City Board of Supervisors whether its agencies
should use facial recognition technology, and it is right to debate the use of new
technologies in democratic societies.</p><p>Live Facial Recognition (LFR) has the
potential to play an important role in tackling crime, and the police here have commissioned
independent reviews of its effectiveness. The police have broad common law powers
to prevent and detect crime, which allows them to use surveillance cameras and LFR
in public places for policing purposes.</p><p>However, these powers must be exercised
in accordance with the law including the Police and Criminal Evidence Act, Human Rights
Act, Data Protection Act and having regard to the Surveillance Camera Code of Practice.
Possible matches produced by LFR systems are always checked by a human operator before
deciding what, if any, action to take.</p>
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