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Forensic, alternate light sources

Essay specific features

 

Issue:

Science

 

Written by:

Phyllis C

 

Date added:

June 28, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 503

 

Was viewed:

7236 times

 

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Essay content:

There are three distinct types of light interactions that may occur when an object is seen through this method, those being: fluorescence, absorption, and oblique lighting. In fluorescence the light is reflected by the evidence, thus causing it to shine or fluoresce; in absorption the light is obviously absorbed by the evidence, thus causing it to be darker than its surroundings; and in oblique lighting, light is emitted at an object at low angles, thus causing it to give shadow and reveal small particles normally unseen...
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The most common use of alternate light sources is to collect fingerprints. This method can be 10-100 times more precise then the standard dust and lift method, and allows fingerprints to be taken off of a larger number of surfaces. Another use of alternate light sources is to spot bodily fluids such as saliva, semen, or blood that someone has attempted to cover up...
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