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When the police used ANPR data to study Khan and Uddin’s movements, they uncovered another surprise: the duo hadn’t travelled alone. Officers dug into the national database using a technique called “convoy analysis.” First, every record of Khan and Uddin’s car trip was recalled from the system. Then another set of plate numbers was generated: those of every car that had passed by those same cameras within a few seconds or minutes of the pair. By comparing this set with those at the next camera site, and the next, and the next, the police identified a second car that had travelled in convoy with them from Birmingham to Dewsbury. Within 48 hours, police arrested not only Khan and Uddin, but four further members of the group from the second car. All six men later plead guilty to preparing an act of terrorism, and were sentenced to a total of 111 years in prison.

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in a British study, trained supermarket cashiers were tested on their ability to screen shoppers using credit cards that included a photograph of the card owner. Each shopper was issued four cards: one with a recent picture of the shopper, one that included minor modifications to the shopper’s hairstyle, facial hair or accessories (e.g., glasses, hat), another card with a photograph of a person similar in appearance to the shopper, and the last card with a photograph of a person who was only of the same sex and race as the shopper. When the various cards were presented to the checkout clerks, more than half of the fraudulent cards were accepted. The breakdown was as follows: 34 percent of the cards that did not look like the shopper were accepted, 14 percent of the cards where the appearance had been altered were accepted, and 7 percent of the unchanged cards were rejected by the clerks.

A 2003 report by RAND into facial recognition technologies cites a British study of how bored supermarket cashiers are…

http://www.rand.org/content/dam/rand/pubs/documented_briefings/2005/DB396.pdf