EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
This is a scanning electron microscope image of gunshot residue. This residue is deposited in the vicinity of a firearm being discharged. Analysis of the direction and amount will yield how far a firearm was from a victim when the gun was discharged. The criteria most commonly used in this determination is the presence or absence of gunshot residue, the pattern diameter, and the type and distribution of gunshot residue.
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