Download Now You Know Crime Scenes: The Little Book of Answers by Doug Lennox PDF

By Doug Lennox

ISBN-10: 1550027743

ISBN-13: 9781550027747

With hit cop television dramas just like the a number of CSI and legislation and Order indicates, Bones and legal Minds. every body turns out to imagine they are a forensics professional. yet what can we relatively understand? Now, with Now you recognize Crime Scenes, we will all get the dope on: How lengthy does it particularly take to research a DNA pattern? Who all started the 1st forensics laboratory? Who invented legal profiling? How do you do a walk-through?

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Sample text

Fingerprints have three basic patterns: arches, whorls, and loops. Most people have arched ridges, about a third have whorls, and loops are uncommon. On their own these catagories are inadequate to make a positive match, so when comparing prints, the centre, called the "pattern area," is examined for line types that further contribute to its uniqueness. Distinctive line types include spirals, bifurcations, and islands. Centre points of sweat glands, ridge path deviation, and the exact end points of islands are examples of very small features, called "minutiae," that also receive consideration.

Why do super cops use superglue for fingerprints? Superglue fuming is a technique used to make latent fingerprints visible to the naked eye. It works because a component of the glue called cyanoacrylate bonds with sweat residue. Fuseo Matsumur, a Japanese trace evidence examiner, received credit for discovering the technique in the late 1970s when he made a mistake while preparing a 56 Biometrics slide for examination under a microscope. What are the different fingerprint patterns? Fingerprints have three basic patterns: arches, whorls, and loops.

How do lie detectors work? Lie detectors do not detect lies; they detect symptoms of lies. Their other name, polygraph, came about because their many (poly) sensors record their findings on graph paper. Lie detectors monitor breathing, pulse, blood pressure, and perspiration. John Larson, a medical student at the University of California, built the first one, which received widespread use, in 1921. 43 Now You Know Crime Scenes Why is lie detector evidence not admissible in court? John Larsons invention of a lie detector quickly prompted challenges to its ability to make a reliable assessment of a subject s honesty.

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