An elite group of police officers have the job of identifying each suspect captured on CCTV.
Known as super-recognisers, these policemen have the ability to match faces on camera to those stored in their photographic memory.
This exceptional ability has helped prosecute hundreds of people who took part in last summer's troubles.
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18 year old Shafiq Smith was charged early this morning with the murder of Omid Saidy
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Omid Saidy, 20, was knifed to death after asking a drug dealer and another man to leave the area, police say.