Decisions in Fingerprinting

Amount of Perceived Detail in Agreement Mated Pair
Same Finger
(actually guilty)
Nonmated Pair
Different Fingers
(actually innocent)
Low High Criminals in jail: 100 test test test test test Examiner
responds
"Exclusion"
Examiner
responds
"Inconclusive"
Examiner
responds
"Identification"
123 cases where the examiner contributes incorrect information that could help set a criminal free, 123 cases where the examiner believes they have insufficient evidence to make either an identification or exclusion decision, and 123 cases where the examiner contributes correct information that could help put a criminal in jail.
123 cases where the examiner contributes correct information that could help an innocent person and the detective will continue working the case, 123 cases where the examiner believes they have insufficient evidence to make either an identification or exclusion decision, and 123 cases where the examiner contributes incorrect information that could help put an innocent person in jail and could help the true criminal remain free.
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