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Even small reductions of accuracy harm a scheme in which thousands of random people are being compared with more thousands of people from a “lineup” database. This causes fales positives for the same reason the “birthday paradox” causes you to find people with the same birthday: for N people, you’re making N(N-1) comparisons. When N is large, the absolute number of error soars.
An intelligent, insightful report on the topic. This is something that should make people think.