FSCI 1010U Lecture Notes - Lecture 4: Right Angle, Generic Point, Tiffany Glass

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Locard"s exchange principle tells us that: every contact leaves a trace. Many different types of transfers: person to person, person to place, primary: direct contact. (ex. Soil from gravesite: secondary: indirect contact an intermediate object is the site of transfer (ex. Dog car dog hair on human) Quite often the evidence that is transferred is small or even microscopic in size, making analysis quite difficult. Should be of no surprise that our microscope is one of the most important tools of the forensic trace analyst: analysis is typically called microanalysis . The application of a microscope and microscopical techniques to the observation, collection, and analysis of micro-evidence that cannot be clearly observed or analyzed without such devices. Generally deals with samples in the microgram (mg) or milligram (mg) Often operate using different forms of energy: visible, ultraviolet, infrared, electron. If you probe matter with energy, you can obtain useful information used to tell you the chemical composition of the sample.

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