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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Gunshot Residue (GSR)
Whenever a gun is fired, particles from the bullet, propellant, gun and primer are deposited on the shooter's hand, clothes and environment through the cloud of smoke created by the explosion inside the gun.
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Crime scene investigations
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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