Dating fingerprint cases
Fingerprint records normally contain impressions from the pad on the last joint of fingers and thumbs, although fingerprint cards also typically record portions of lower joint areas of the fingers.
Human fingerprints are detailed, nearly unique, difficult to alter, and durable over the life of an individual, making them suitable as long-term markers of human identity.
When the police finally caught up with him, Klutis went for his gun and the police returned fire, killing him.
When they compared his postmortem fingerprints, police found that each of his prints had been cut by a knife, resulting in semicircular scars around each fingerprint.
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There are many documented cases of intentional fingerprint mutilation, but generally those involve pretty severe damage to the skin—more specifically between the generating layer, where the template of the fingerprint survives, and the upper layer, the epidermis.
Pretty much any cut or burn that goes deeper than the outer layer of the skin can affect the fingerprint pattern in a permanent way.
Ultrasound devices go beyond just the outer layer and capture part of the root system.
On average, the rejection rate for [scanned] fingerprints is about 1 to 2 percent.