Microtraces
When a handgun is fired the detonation of the cartridge and gas leakage around moving gun parts, in addition to blow-back from the muzzle, carries small particles (gunshot residue: GSR) to the shooter's hand.
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Footwear evidence is often the most abundant form of evidence at a crime scene and in some cases can prove to be as specific as a fingerprint.
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If a crime scene contains microscopic samples of hair, diatoms and pollen, an electron microscope can be used for identification of these samples.
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