The New Yorker has a fascinating article about a special unit established in London's Metropolitan Police Service that has peculiar -- in every sense of the word -- expertise in facial recognition:
Most police precincts have an officer or two with a knack for recalling faces, but the Met (as the Metropolitan Police Service is known) is the first department in the world to create a specialized unit. The team is called the super-recognizers, and each member has taken a battery of tests, administered by scientists, to establish this uncanny credential.