Forensic and Investigative Science FIS 20500 Lecture Notes - Lecture 3: Finger Ridges, Cyanoacrylate, Hydrochloric Acid
25 Aug 2016
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Donor contains a 3d marking that can be transferred to a recipient: fingerprints. 1st used in nyc in 1902 in prisons (west and west) Left b/c of the oils in the ridges of finger. Can grow back unless severely burned off. Patent prints: visible to the naked eye; 2d. Plastic prints: visible; 3d; molding of print. Latent prints: invisible; composed of sweat & oils; have to be developed. Alternate light source: lasers or black lights. Chemicals: some react w/ the amino acids. Prints will last as long as the object its on but we can determine the age of prints. Galton: 1st to scientifically study prints; developed the classification. No standard of how many points needed to make a match. Each finger is #ed & has a value (if it"s a whorl) 1024 values we can come up w/ Even fingers +1 = class # (do not reduce) 2: formation (ridge endings, bifurcations, dots, or combos)
