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The combination of the finger-scan and the search code are then looked up in a central database, to ensure that they tally, before the transaction is approved.
ECONOMIST: Security
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Szczesny has missed four matches since damaging the middle finger on his left hand but was given the all-clear following a scan last week.
BBC: Wojciech Szczesny
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Participating passengers are asked to scan their passport photo page and have a print taken of their index finger.
CNN: Heathrow tests biometrics